Other players have no trade clauses, so it's not unheard of and is staying to become more common...
"Other notable players whose contracts include no-trade clauses are Chiefs QB Patrick Mahomes, Buccaneers QB Tom Brady, Seahawks QB Russell Wilson, and Cardinals receivers Larry Fitzgerald and the aforementioned Hopkins"
I mean, he had zero input on Culley. They fired multiple people from the old staff after that hire who weren't hired by Easterby and that Watson supposedly liked. Your assertion that they've bowed to Watson doesn't hold up at all.
You can think he should have no input and that's fine but you can't make the claim that the "owner is really setting a shitty precedent by signaling he'll undercut his staff's decision making". Sounds like you made that claim without really knowing what you're talking about. Easterby is in control.