Yes, I don't understand why 4 and 3 stars are considered not good enough for college tennis. Before the foreigners came, they were good enough to play college tennis.
I would say that 99% of 3 & 4 star kids are hardcore tennis players. They may not be as talented as blue chippers, but they work just as hard and have the same passion for the game. Who is to say that they don't belong in college tennis.
Yes, and some of those 3 and 4 star players maybe just as talented or more talented than their blue chip counterparts but may have started playing tennis at a later age, did not have the quantity and/or quality of tennis coaching of their blue chip counterparts, are late bloomers, or their parents did not have the funds to fully develop their talents, etc.
Whatever the case may be, they should be good enough to play tennis at the vast majority of DI, DII, and DIII schools.