4 freshmen in your top 8 rotation makes you awfully young for a championship contender in the transfer portal era. The last 2 years, none of the Final Four had more than 2 freshmen in their end of season rotation. Even without COVID seniors next year, teams will still grab veterans from midmajors and the resource-lacking high majors.
You can take 4 freshman, but taking top 50 guys means they expect to be in the rotation. If they're not, they'll leave anyways, so you don't gain much benefit from having them. So taking a 4th top 50 guy has a big opportunity cost. 3 and a development guy is much better than 4 top 50 guys IMO.