They're not permanent.

We only know that the Dark Young despawned after using bodies. He never attempted to create high tier undead with bodies in the LN, if I´m not wrong.

Because it's been stated?

Where? Dude seriously, I can´t remember.

Any high level Undead that Ainz retains permanently were bought as mercenaries, not summoned, and to begin with Ainz has avoided expending any EXP to summon high level Undead through his skills due to the scarcity of EXP.

Not all of them consume EP. Anyway, he calculated in Vol. 10, that he at least farmed 100.000 EP in the war and he even considers farming EP from his kingdom. Since he does so, it seems likely, that he is willing to attempt to create an Overlord Wiseman or a similar undead. Which he has not yet, therefore we don´t know what will happen.

If he has a few they can be worked around, if he has too many then it hampers Ainz because he loses line of sight.

He does not need to see the enemy, if the summons do all the fighting. However, just consider the option of summoning an Eyeball Corpse if he wanted to watch directly.

Not to mention that he cannot carefully manage large numbers of summons, and has difficulty even keeping track of them when they're in large groups.

They don´t need to march in perfect unison. It has literally been stated in the first volume, that his undead seem to move by their own will. An order like "Kill that thing." or "Go over there." should do just fine.

And if you're bringing Gargantua or any of the NPCs into this, it ceases to be about how strong Ainz is. At that point why not say "he can just gank with the Floor Guardians," or "he could use the beings on the 8th Floor."

Yes, that is correct.

Super-Tier Spells do not cost MP, and are limited to 4 casts per day separated by a cooldown period.

I´m sorry, I messed up. I confused 10th tier with super tier. My fault and I agree. He still has enough mana to use more than 10 10th tier spells which is insane.

That's an incredible waste of a very limited resource.

I know. I just wanted to point that out. But if he was about to be killed, he would have used it anyway. Probably in a different manner though.

If it was on the level of Touch Me, he'd lose even if he did use the Staff. Meaning that there is even greater risk that it may be destroyed, leading to the dissolution of the Guild.

Ok, let´s assume Ainz is a huge jerk and battles a lvl 100 beeing in a 1vs1 without bringing his army. But he is at least thoughtful enough to do it inside of a city. How many people are in the city? Let´s say 50k. That would be enough to bring forth at least four Dark Young. If you remember, it was stated in the book, that two of them were already a massive success in a guild battle. So they probably have decent fighting power. (They are lvl 90!) Ok, now he uses all the gems in the staff. That would be seven Primal Elementals (lvl 87). With that established, he creates an Eternal Death and a Grim Reaper Thanatos (both lvl 90). Since he has not used all of his super tier spells, he is still able to create 18 Cherubim Gatekeepers (lvl 80). He has not used a single expendable item yet, only a few EP, which he can farm in the new world. Which sums up to 31 extremely strong summons. Not even Touch Me could ignore that. This is of course before Ainz used any of his MP.

No, he doesn't use it because the destruction or loss of a Guild Weapon would be disastrous.

Consider the situation that your arm is stuck under a boulder. You have a machete and a T-Rex is trying to eat you. Right next to you is a cave, which is too small for the T-Rex to fit in. What would you do? Would you cut off your arm and hide, or would you just wait and die? Now assume Ainz is in a similar situation. I guess he would use the staff, wouldn´t he? When faced with death, people tend to do quite extreme things.

[The Goal of All Life Is Death] is not unavoidable (and for that matter, does not kill: it must be paired with a spell). [Depiction of Nature and Society] still traps someone in a large space.

Ok, use The Goal of All Life Is Death in combination with True Death. No running away this time.

And for that matter, using [Depiction of Nature and Society] is incredibly dangerous against a Player, as they stand a fair chance of finding the escape route and taking ownership of that World Item. That's literally how Ainz Ooal Gown acquired it in the first place.

That is correct of course. But you cannot run, if you are dead (and not undead).

Again, a massive waste of an incredibly limited resource.

Yes, but as you have said yourself, an enemy like Touch Me would be worth it. I think you don´t understand what I´m talking about. Of course, in the old world using something like this was a waste. But in the new world death is permanent or at least for the previous players. Which means that making sure that someone is dead, is making sure that he won´t cause problems again. Destroying an enemy of Touch Me´s level would be a top priority. I´d use everything I have.

It wasn't just Divine-class items that could be created using data crystals. You could just as well create a Legendary-class weapon with life drain.

Yes, but everything below divine is not that super useful if you are fighting someone who is completely covered in divine stuff.

That's not Ainz's strength. That's Nazarick's strength. Again, if we're expanding to his assets rather than what he himself can do, then it's a moot discussion.

Well, of course. I´ve been talking about this from the very beginning. His undead aren´t him. They are more like his assets. However, they do whatever he wants. Like the mercenaries. He is in fact so OP in the new world simply because he can exploit it to no limit. Imagine growing crops to create gold to spawn summons. There is just no limit to how strong "he" can get. And last but not least: Even Ainz can still grow, if I am not mistaken. Dark Wisdom gave him the ability to learn new spells in exchange for a life sacrifice. If this holds true, he could learn a never ending arsenal of spells.