They really don't do any of that until this final movie, and even then only a littleAll right, I think I can share this. I have not seen A:E (nor any of the other MCU films, TBH), but what I've heard about Endgame has made me realize why I really stopped following Marvel Comics back in the 1990's.
The way Marvel deals with multiverses and Alternate Timelines makes DC's Crisis on Alternate Earths look positively sane by comparison. I just recall all the things with the X-Men and how things got so out of hand you forgot what the team looked like this month, and I suddenly realized that this was exactly what they were doing in the MCU.
The more you mess with timelines, the more unwatchable/unreadable a universe becomes. The only fictional franchise where it's worked is the one that intentionally hand-waves it away with a flick of a sonic screwdriver and a whirr of the TARDIS. Not even Star Trek does it well (oh, hai, Discovery!).
Marvel Comics FUBAR'ed the comics up with alternate universes and timelines. Doing that to resolve the Ultimate Bad Ending issue makes it head-bangingly frustrating.
Just my $0.02.
P.S. - Not planning on watching A:E, though I might rent the original Iron Man just to see Downey at the beginning of this long ride.