it's about the directors and the actors.
they got rid of derrickson but jon watts is doing F4
and reed is doing ant-man 3
. they need the russos and favreau back. they need to get del toro on board.
they might have run out of hyper talented (but not typecast/star) special actors. the MCU hit a home-run with most of their casting in phases 1 and 2. how are they gonna find another scarlett or RDJ? actors with a profile which that is bigger than their acting careers and charisma off the charts.
more recently so far we got "ok but a bit of dumpling" as the "hyper athletic" new widow, plain-horrible as captain marvel, ali as blade (nowhere as good as snipes), spotty casting in eternals etc. they need to get home-run actors on board asap.
new widow is so chubby she had to hide it by wearing a coat in most of her hawkeye scenes.
they have to crack the casting of the F4 and esp. (to avoid endless negative comparisons) the x-men, in particular wolvie, prof X, jean, cyke, storm, magneto. get that wrong and yeah, the films will suffer massively