Short, and while I think the evidence is good for his processing, you rarely *really* know if a QB prospect can handle NFL speed until you see them at NFL speed and he's not one of the very small handful of guys in my lifetime who you know for sure.
The list of generational QB prospects is Elway, Manning and Luck. Williams isn't on that level, and if we're including him as "generational" we're going to need a *new* word for those guys and the point of generational was to separate those guys from the guys like Williams.
Someone on reddit suggested the term "presidential" for guys like Williams and I like it, as in "probably the best prospect you'll see in a four-year cycle."