TL;DR
Disney wanted year-round MCU content to prop up Disney+, Kevin Feige agreed to appease his bosses and so he could explore supporting characters who couldn’t carry their own movies.
Feige quickly got spread too thin trying to manage so many projects, leading to subpar scripts, ballooning budgets and content bloat.
After the back-to-back flops of Ant-Man and the Wasp: Quantumania, Secret Invasion and The Marvels, Disney and Marvel reassessed their release strategy.
Brad Winderbaum took over Marvel Television, which will now only release standalone, lower-budget multi-season shows with street-level heroes (basically the Netflix model all over again).
Starting with Thunderbolts, Feige is completely hands-on again, and there is a bigger focus on getting the scripts locked down before production starts, after Covid and the Hollywood strikes forced them to shoot several films with incomplete scripts.
Many projects like Blade and Armor Wars whose scripts were considered subpar were put on hold to be revisited once the Multiverse Saga concludes.
Feige has a 10-year plan for the mutants in the MCU.
wsj.com