Maybe those officials are guys who want to work in the playoffs, where it is 3-man only, college officials who are used to working 3-man more than 2-man, or officials who sincerely believe that 3-man is a superior system than 2-man, and refuse to work 2-man, so that they don't compromise their play calling percentages. 3-man is simpler, but it requires a greater level of discipline than 2-person, so I would be more concerned about 2-person only officials (with exception to those such as BillyMac, who work in areas with limited regular season 3-person opportunities).
Nevadaref, is it specifically your area of California that mostly uses 2-man, or a statewide thing?
AFAIK, the Desert Valley Basketball Officials Association, and quite a few of the Northern California associations use 3-man for regular season games, enough so that Greg Austin, the owner of the A Better Official YouTube channel and website, has to make some videos about 3-person officiating. Maybe 3-man is also widespread in Southern California as well. It's been a little more than 10 years since I lived in the Golden State, so I'm not up to speed with how things are done there.
Is Nevada mostly 2-man, a mix of 2 and 3-man, or all 3-man at the varsity level?