Quote Originally Posted by GloatingSwine View Post
As has been pointed out several times in the thread though save DCs of monsters increase at a higher rate than even the supposed strong saves.

Which means that the projected chance of success of players making any kind of save goes down over time.

It’s a red queen’s race, you need to run as fast as you can to try and stay in the same place. But you’re doomed and can’t.

Because they designed a system where saves didn’t change much over the range of levels and then forgot they’d done that when they wrote the monster stats. (Along with all the other design principles they said they were working from, like negative correlation between ac and hitpoints)
DND has had strong treadmill tendencies since 3.x. 5e went a long way to dial it back but it didn't remove it completely. Hard to not have it creep in with such a broad PC progression of 20 levels and jumping from local hero to world changers. (It's doable but very difficult)