A lot of coaches would beg to differ with you about the 4. It’s now mostly a perimeter position because most teams play 4 out offense, if not 5 out.
Depending on the coach, the 4 might be the secondary ball handler, or a great shooter for trail 3s (both traditionally perimeter skills), because a lot of times the “4s” responsibility is to take the ball out to start transition offense. The reason Hawkins can play there is because he has enough of both of those skills to keep the defense honest.
Otherwise, you see our 4 outside spots occupied mostly by guards and wings, making one of them the “4” by default.