This is the truth. And the Bucs should have moved on from Wintson and the Titans should have moved on from Mariota 2 years ago as well. Teams over-commit to QBs they drafted and it holds them back.
Mahomes was OK in his first start. 0 TDs, 1 INT. Maybe you're thinking of his start in week 1 of 2018, but his first start was week 17 of 2017 after the Chiefs locked in their playoff spot. I remember thinking he looked alright, but he still made a huge jump by week one in 2018. The same is true of Watson and his first start, but I think you're still right in that when you watched them play you said to yourself "this guy looks like a quarterback" which I don't think I could ever say about Mitch. Poor guy got way overdrafted, was booed by Bulls fans before he even took a snap, and then proceeded to be exactly who we thought he would be.
Right now, Josh Allen is at times Mitch and at times Mahomes and I hope he finds his way to being more like Mahomes in the second half of this season. I really want him to be the guy.