Love Schaefer but a lot of hyperbole based on where scouts rank him.
The thing that would make Schaefer worthy true 1D projection is the hockey IQ and ability to control the flow of the game, not just skating which is easy to see. We saw him dominate but was it just his ability to skate faster than others vs how he broke down and control the game in tight spaces when skating matter less. The latter is tough to evaluate. I think it was there in the Hlinka but it's really small sample especially over the past 2 years and we'd ideally have more data to evaluate his progression when teams game plan for him. Some scouts do see the risk but just think it's worth the risk rather being a slam dunk imo.
You need IQ to really max on skating or else you have the Morgan Reilly and Shea Theodor tier instead of a true 1D like Doughty. Should also discuss the weakness, his production overall wasn't huge. We want to believe and there's basis, but we just didn't see how he would react to long season up and down to see how he adjust to teams playing against him. There's a world his ability to control game and IQ hits a ceiling or take much longer than we thought due to missing critical dev years. He may just end up as top pair minutes eating LD which can be had without spending 1OA or true 1D. Also, he's not very physical, and he gets beat by being tentative by backing up on D despite exceptional skating. Neutral zone and gap control could be improved. He's not projected as shut down D but still good to discuss his weakness not just his public draft stock... A guy like Jackson Smith for example has just as good skating perhaps and more physical but big issue is IQ but in this case it's too soon to rule him out from putting it together just as it's too soon to say Schaefer is Doughty imo. If you just take a 10 game snap shot for Smith at the end of season when he was on a heater, you might have said he looked like Doughty also. Or even Boumediene if you only look at his peak in World instead of NCAA...
Overall though, agree the scouts see more than us to say it's worth the risk but I am not sure it's a slam dunk. We know scouts can be wrong too especially when there is small sample to evaluate for progression.