I’m not so sure that’s true… in fact the 1998 Tennessee team had exactly zero players from California.
The official 1998 Football Roster for the University of Tennessee Volunteers
utsports.com
At a glance it looks like about 50% were from Tennessee, and about 90% were from Tennessee or the bordering states (GA, NC, SC, AL, MS, KY, AR, VA). And the remaining 10% were mostly from southern states: FL, MS, TX, OK.
Tennessee’s current roster has
way more players who aren’t originally from Tennessee (most of them are from Georgia.) They have kids from California, Jersey, Arizona, etc. now, and they didn’t back then. I’d be willing to wager they were able to keep way more of the best in state talent at home in 1998 than they do now. In 2022 ZERO of the top 10 recruits from Tennessee went to Tennessee. Vandy and Tennessee both only had 1 each of the top 20 players from the state. Compare that to 2007 when they had 4 of the top 10 in-state players and 10 of the top 20.
I don’t think having a national recruiting base is all that important. I think it’s way more important to land the best players from your own state, and the surrounding areas. Plus, doing it that way makes it easier to grow fan support and inroads with local communities who are more likely to get involved with the program.