Maybe it's all just part of the rumoured reboot? Like space-time/Multiverse collapses and the events are relived or whatever and they make any continuity changes etc. They want through that.
I don't think a reboot is happening. We've seen time and again (usually from DC) that reboots inevitably cave to fan demand to bring back the status quo, leaving the universe more complicated than if the publisher had done nothing at all. Marvel has made this very clear with explicitly making " the death of Spiderman", " the death of wolverine", " the unworthy Thor" and "cap is geriatric" limited time events. These changes are not meant to stick and you'll be back to normal eventually.
Now, SIMPLIFYING the MU? Different story. The ultimate universe has long outlived its usefulness and needs to go. There's no reason for dozens of different hyperions. The abstract tier is a mess of cubes and gauntlets and heralds and m-bodies.
Getting rid of all that and cleaning house has advantages, and fans are less prone to riot.