Issues with character development after a great start?

Rating: 7/10 (24 May 2019)

First of all awsome movie, Thanos not the greatest villian in the multiverse (havent watched endgame yet as of this writing)
I dont know what they want to go for but hey why dont we have character development for the old crew, guardians on top, strange awsome, great arc for thor, but nothing of character development for Cap, Black widow, hulk isnt there, and hawkeye cant fight anymore because The secovia accords
The best villian in the MCU is loki, RIP