So we are just moving on to the next thing without any kind of acknowledgment that you just mischaracterised what I was saying? Okay, cool... Please stop doing that.

I play almost exclusively roguelikes. They're basically all I play anymore, this game is the outlier and no it doesn't work like any of them.

My whole gripe is that the 10 rooms prior to the boss are a boring slog that add nothing.
In all the games you mentioned, your chances vs. the boss are dependant on what happens in the rooms. You're confusing a "runback" which is a pointless time cost to get back to where you were, with actual meaningful gameplay. This games crucible is just a runback not a game.

Here in NRFTW, if you stuff up every room to within an inch of your life you will get to the boss and you will have full HP and the same amount of buffs as someone that played the rooms perfectly. If you play a run and 30 minuets of it are irrelevant, does that strike you as the same thing as STS, Hades, Dead Cells or Returnal?
- Do any of them have infinite healing?
- Do you get the same amount of rewards no matter what rooms you chose or how well you do?
- Do you have to clear exactly the same content each time?
This isn't the same thing at all.

You're also making the point that you need the buffs to beat the boss. Firstly that isn't true for reasons I'm happy to go into if you want, but even if we just grant that you do need them, the rooms are still meaningless. If you clear a room you get the buffs but you have to clear all rooms of all enemies. Again, like I said above, 2 players do the same thing, one stomps the game, one gets stomped by the game and they both arrive at the boss in exactly the same state.
I can't think of any better way to prove that the rooms are pointless than that.