I dig your post but I don't agree with this assessment. The issue was always his touch touch on his passes (and to a degree, decision making beforehand).
Do you recall what the announcers said on Milton's very first pass in the Missouri game? They talked about how it was a rocket and thrown very hard - for a horizontal pass that was about 7 or 8 yards. And it was thrown super hard. That's Milton's MO. He's done that since his first appearance, not just at Tennessee, but in his first year at Michigan. Here's a quote from a receiver that played with him at Michigan when he was there -
“Joe Milton’s arm is very strong,” Black said. “That’s what I’ll say – he’s got a rocket, man. It’s kind of hard to catch from him sometimes. He has to take a little bit off at times, he just doesn’t know how strong his arm is sometimes. He’s really good.”
Again, same tendency, four years into his development. Everyone always raves about his rocket arm, which is true, but rocket deep passes alone aren't enough. He's got to have more control over his throws, so he's not firing rockets every play that either go over the receiver's heads on deeper routes or hitting them like bullets every time on under routes.
I'm not hating on Milton either when I say that, or at least, that's not my intent. I hope he's taken steps forward and can do these things now. He's gotta have more finesse on his throws, and he's got to be able to read pre-snap well enough to know where to throw 'em, especially under pressure. That's all it is.