Crisis on Infinite Earths was designed to fix their continuity issues. And while not perfect, it did.
So of course they have spent the last three and a half decades going back to the crisis/multiverse/reboot well so many times that it has lost all meaning, and they have gotten increasingly bizarre with each subsequent attempt.
Marvel's sliding timescale of "All that stuff from the 60's was really only like 12 years ago" is downright efficient by comparison.