It's hard for me to be very critical of QB development, given Skylar's obvious improvement, demonstrated last year.
Really, my only criticism of this staff's QB development is that Howard *should* have been relatively ready to go this year though. Third year in the program should be enough time, but maybe Covid stuff impacted his development somewhat. Even if Howard was a miss (which it looks like, imo, but still lots of time for him to rewrite that), I don't think one poor outcome is enough to conclusively say they can't develop QBs, especially in light of Skylar.
Martinez's play has been pretty wtf, but there's a lot of factors at play there.