While I agree with a lot of what you're saying, I want to push back against this point. Since the Queseda era, Marvel has had a great eye for talent. Even right now, they've got great writers and artist. Look at how many creative teams Marvel puts together stays together when they go to Image.
The problem, though, is they don't what to do with them right now. It's like watching a great basketball team under indecisive coaches and management. Putting in point guards as power forwards, and then switching them back. Bringing in power players for half a period at the beginning of the game, but then pulling them after 3 mins.
Part of that is Marvel is so thirsty for their next set of architects that they've skipped shepherding talent. Reminder found his legs on books like Doctor Voodoo and co-writing Punisher with Fraction just before he left. Hickman was on a dying Ultimate book before moving him up. Editors like Wil Moss are still grabbing interesting writers, but instead of quietly letting them work on their craft, they need to make big splashy announcements. A writer like Gabby Rivera would benefit greatly from a co-writer. I'm sure Gillen would have loved to work with Rivera for at least that first arc.