Sadly i mostly agree with this.
My theory is Kang Dynasty fell apart and no director wanted to jump on “first avengers bomb”. So they got the Russo’s back. Russo’s wanted bigger than Infinity War, so Secret Wars. Can’t do SW without Doom and that’s how RDJ and Evans get back.
for a film that had no prior 10 year development to back it up, the russo brothers did a heck of a job setting the premise for avengers doomsday only in a little over one-year span