Your original point was what does it mean by Midcore and you fixated on the boss difficulty instead of the overall aspect of the content.
I disagree with that kind of thinking, but let us play your argument a bit here.

You like an 8th man raid of roughly Ozma level of difficulty, which is exactly what a normal raid is considering that in Ozma level of difficulty, the difficulty is being masked by the fact that there are 56 players contribution to the raid.

Do you want more individual mechanics without any consequence of wiping like BA or Diablo? Yeah thats normal raids. Let me give you an example

1) P10 webs placement, tower dodging
2) E12 Titan Junction, Shiva Junction
3) M2 Lives, M3 dashes and movements
4) O5 trains, O6 paints, O3 Hali Maze

You want a mechanic that straight up kills you like AV's puddles and have some more actual enrage. Okay,

1) 4 lords Extremes are literall individual mechs that almost has no impact on the overall party.
2) Innocence
3) Valigarmanda literally only has 1 body check mech and thats the tank buster
4) All of endwalker extreme except golbez has no body checks and all individual mechs.
5) The entire Unreal content because people need to realize that majority of old trials mechs are made in an era where none of the jobs have this much leeway thanks to the amount of simplification.

Difficulty of an 8th man raid is depended on the consequences of someone dying because you rely on less people. Asking just to do BA without understanding that BA mechanics or Diablos mechanic condensed down to 8 people without any of the dead consequences is just asking for casual level raid. Because that is EXACTLY what they do to normal raids, they make Savage first, and then remove all the consequence of dying so you can clear it.

Which is your fixation on whatever true extreme is, is weird tbh because I have mentioned multiple times that extreme is doable blind in 2-3 lockout even if it had body check and someone else in this chat have already mentioned the variety of extremes that even sprouts can clear in 1-2 lockout.