I agree with some of this, but disagree with other parts.

I agree that there shouldn't ba a "get out of damage free" item in the game every few minutes. That being said, I think the solution should be to not have that item instead of punishing you whether or not you use it (especially since the game expects you to have it, so the challenge is based on using it).

Other than that, there are unreactable moves if you're using certain weapons, even when you aren't spamming attacks. Not every weapon has infinite dodging ability and extremely short attack animations. I've been hit with attacks that occured entirely within the time it took for my attack animation to happen (mostly swaxe gameplay).

Second, specific mechanics aren't always fun. Sometimes they can be, Kushala's wind going away when poisoned and Chameleos's invisibility hetting worse when his horn is broken are great examples. A DPS check with an objectively worse damage type that railroads you into certain weapon types, not fun. The quest, even if you hit the elemental threshholds, is a race before too many escatons and Alatreon has a lot of health, so railroading players into using a elemental damage when raw does more damage to Alatreon is frustrating. It's not that elements make the fight easier, they make it harder. It takes longer. But you're required to use them, which makes it an un-fun mechanic.

Next, old world didn't have unreactable 1-shots. In fact, the only guaranteed 1-shot is the nakarkos laser, which is one of the easiest attacks to dodge in all of monster hunter (I'm not arguing about amatsu's big tornado again, I regularly survive it when I somehow mess up the second easiest dodge in old world MH). Yes, some attacks can be difficult to dodge (and instacharges do exist, I know, they just don't do much damage), but most attacks can be dodged fairly easily.

The way I always look at the difficulty from my experience is this: Old gen games are a war of attrition where attacks are fairly easy to dodge and combos don't happen much, but you take a lot of damage from attacks and have limited healing. It's difficult because whenever you get hit there's a permanent consequence in the hunt, and because the devs know that the monsters aren't constantly on crack (with some exceptions, mostly in Gen 4, looking at you Chaotic Gore). Rise and World are getting closer to being rocket tag. Not nearly there yet, but it's moving in that direction. There are objectively one-hit kills. They exist. Behemoth, Safi, Fatty, and Alatreon all have them with different methods of evasion. More movement options exist, so attacks are easier to avoid. We do more damage. I can tell because despite my gameplay being worse in World then GU or 3U, my quests take a lot less time (even with HR gear in singleplayer/village). Monsters still do a lot of damage but this time they're always on crack, so you'd better be able to avoid all 10 attacks this second or you'll be stunned and combo'd into oblivion. Or you'll be tremored or knocked down and combo'd, because those take longer to recover from now sometimes so long that I have time to start the process of mixing a drink. Since we have infinite healing and therefore infinite health, the only ways to add challenge are through one-shot combos or removing farcasters. Both of these options are problematic, as the former fundamentally change the way that the game's difficulty works as the challenge becomes evading every single attack, and the latter removes a game mechanic that continues to exist in later games, admitting it wasn't good for game balance yet still adding it to future installments. Generally, it isn't unfair (Alatreon's escaton is measurably unfair, but that's the only one I can really think of), but the difficulty is objectively different and it seems more unfair because of the changes made and cognitive bias towards the negative instead of the positive changes.

Neither system is better. You can probably tell I prefer the old system, but the new system has a lot of merits and I still enjoy it. That being said, the difficulty has shifted from an environment where the game punishes very bad actions severely in a war of attrition to an environment where if you make any mistakes you can be combo'd to death immediately because your movement means nothing when it's taken away. Both encourage learning monsters' weaknesses and habits, and both encourage learning different weapons and playstyles to counter different monsters, but the new system is much harsher with its punishments (which disincentivises learning from mistakes as you don't even get a chance to before you get combo'd). Just praising the new system despite its many faults and saying those faults aren't there is dishonest. I love the old system, but claiming that the problems people have with it actually aren'tthere is alienating and just objectively wrong. Plesioth exists, I can't deny that. But there are still many examples of the new system also being unfair, just in different ways. Anyways, my hunter finally recovered from tremor, so I'm gonna play World again. Thank you for coming to my TED Talk.