This is the thing, the Lions are at the point where they need franchise level players, they need playmakers. Sure there's a risk if the QB doesn't pan out, but the reward would be greater than taking any other position and with a pick in the 20s, is the risk really that high? If you can get a franchise defensive player and a franchise QB in 1 round, that's a homerun. Then there's a 2nd+ two 3rds to fill other needs.
I don't disagree that QB isn't the biggest need currently but I sure as hell know that Goff isn't THAT guy to lead you to the promised land, not this broken version of Goff, but a legit dual threat QB with high upside COULD be THAT guy.
The funny thing about this draft is that Willis and Corral have a similar skillset to two other QBs who weren't taken that long ago that were considered reaches at the time in Mahomes and Allen, interestingly enough that it was also a QB playing for a mid tier Big 5 conference team and the other from a small school. I just don't see a big risk in taking a shot at one of them later in the 1st round. Trading up like those teams did for Mahomes and Allen would be a much bigger risk. That's a different story altogether. There's also the matter of Green Bay possibly drafting right behind the Lions and blocking them from taking the next Favre/Rodgers.