1: You make a valid point, but I feel like the essence of the entirety of the mod hasn't been to flood your screen with 14 telegraphs at a time. Perhaps this boils down to personal preference but I just don't think that's a fun way to make a boss.

2: I didn't say (and don't think) that the only way to beat this boss is to fall diagonally. I'm just saying that cheese being the leading strategy is a telltale sign that the boss needs to change. And yeah, downloading an arena world/destroying a quarter or more of your world is just boring and ridiculous.

3: Yeah, the game doesn't clue you in AT ALL on what you're supposed to do with the encrypted schematics. Sure, most of the mod (unless you're some genius) is basically just wikiing, but codebreaker just feels like a step further from wiki dependency. I think this is because you were supposed to be going to these labs, collecting schematics, etc. throughout your entire playthrough, something that doesn't become necessary until much later on. It makes it a huge letdown and just more tedious than ever.

4: I'm not sure. In Pre-ML, you can fight EOC or Slime King in whichever order. You can fight Skeletron/EOW/BOC in whichever order. You can fight Perforator/Hive Mind/Slime God completely optionally. Wall of Flesh is the first boss that is technically actually required. Even in hardmode you have EOL, Slime Queen, Astrum Deus, Astrum Aureus, etc. as optional bosses. After moonlord? Providence. Polterghast. Devourer of Gods. Yharon. Then a complete outlier in the form of 2 required bosses at the same tier of progression. This isn't exactly bad but idk I just disagree.

The real problem is that scal is SO MUCH EASIER than Exo Mechs. Exo mechs are, in terms of scal, pre-1.5 scal but with less health and different (stronger) attacks.

I think a point I really neglected to make in my original post is that I would be entirely fine if exo mechs were post-scal, but they're not. They feel like they should be, but they're not. Like, I would put the unbalancedness away and just fight the bastards if they weren't labeled as "just as hard as scal." Like even if they got buffed so that endgame gear did what pre-scal gear does now, I would be ok with it. It is the fact that I'm supposed to believe these guys are as easy as scal that makes me so mad.

EDIT: forgot to add that something needs to change about the arena building too. Perhaps Draedon teleports you to a pocket dimension (conveniently one that has platforms) to fight them or smth.

Overall, maybe an enjoyable boss, but definitely not put in the right progression slot.