The issue isn't the drop coverage itself, most NBA teams (who are really trying to prevent the 3pt/layup barrage) play drop coverage all the time and don't get torched from the midrange like that. Some of that is because NBA teams still force the 3s anyway and avoid the midrange because they can still make them and are all about #trends across the long season, whereas college has many more variables and college coaches will happily take what you give them. But the bigger issue is that: (a) our bigs seem really bad at it whether by design or not, and (b) we really over-pursue on the remainder of the perimeter, which limits any help defense.
(a) may be a byproduct of allowable zone defense and no defensive 3-second violations in college versus the NBA, which force the NBA defenders to move up and out of the lane faster, where we just aim for getting under the basket. Whatever it is, it is causing massive gaps in the lane that simply aren't there in the NBA schemes. We are clearly not doing something right.
(b) doubles down on (a) as there is no help pinching in from the sides, which widens the gaps.
Of course I pointed this out after the State game and was shouted down by the kenpomstats sunshine brigade, who feel that limiting threes is more important than getting repeatedly torched in the midrange. And that is probably true in the NBA where pretty much everyone on the court can light it up from 3 if not guarded. But in college, it is okay to let teams keep shooting 3s, as most are not that good at making them. What isn't good is letting high level college players waltz into the lane with nobody anywhere close to them for wide open 6' shots over and over and over. That may work against shitty teams, but it isn't going to work against anyone who we need to beat to actually make some noise. Forbes, a great talent evaluator and program salesman, has not proven to be a good game coach yet. I think if and how he responds to this glaring weakness in his gameplan will be a big indicator of his coaching ceiling.