I think it gets down to 'iconic' high school players. In the 90s there was less hype around the girl's HS scene, and many fewer opportunities to highlight their skills against other players with fewer age specific international competitions and a less national based AAU structure, but I suspect Lobo would have had that hype as well as Holdsclaw. In the 2000s Parker, Moore, EDD, Griner, and Stewart were all players who were recognized early in HS as being well above the field. These players are different from standard #1 players in a class and Since 1993 Uconn has had incredible success in landing more of them than other schools combined, though having hooked EDD they lost her before they got her into the boat. And the ones they got account for 7 of the 11 NCs.
On top of those iconic HS players Uconn has also landed a number of standard #1 quality players, Shea, DT, Tamika, Anne, Tina, KML, Moriah, Lou, and Crystal - only that run of 4 NCs from 2000-2004 was accomplished with what were 'ordinary' HS talent - a lot of it, but no one who had so distinguished themselves prior to college.
What has been impressive is the development of high level but not #1 talent into NPOY and champions: Jen, Kara, and Sue, and the development of #1 HS talent into NPOY talent and 'iconic' college and pro talent - DT, Tina.
Players at all levels of talent coming into Uconn consistently improve their games with very few exceptions (other than medical issues) and the success in the WNBA of graduates is a testament to that. Geno has gotten great talent to work with, more than his share of iconic players, which has driven a lot of his success, but it is the rest of the surrounding talent which he has developed, which is no better than other coaches have had that has really driven the boat.