You probably did not pay attention to Phase 4 because Kang was introduced on loki, and well introducesd, way more than Thanos on Avengers 1, so that is something marvel is already improving, the thing is the amount of content, that is too much for some people. Phase 4 had some of the best MCU content. Wandavision was top MCU, loki, BP2 was good, NWH too, Shang-Chi has some of the best MCU action, Eternals was not as bad as some people say.