I agree with transparency -- but I think the NorCal committee members include all the section commissioners and the usual suspects from CIF (eight or nine). The NCS committee is secret, for no apparent reason, as a lot of people know one or two members, I understand.
Now Lowell is an interesting case, highlighting the strengths and weaknesses: If Lowell, a school that draws the best academic students in the City and does not have much of an athletic culture these days, is left in D1, its fate is assured from day one: a low seed, a first-round loss (probably a blowout) and no chance to advance against schools with way more talent. If, on the other hand, Lowell is dropped to its proper competitive level, one of its better teams can go a long way -- or also get beat in a good game.
Looking at their schedule, they were 20-12, with a 29-point loss to South San Francisco, and 30+-point losses to O'Dowd and Pinewood. They also lost by double digits to Marin Catholic and Palo Alto, and were beaten twice, the last time decisively, by Lincoln in the SF playoffs.
I would tend to agree that D5 was too low, but Lincoln, which beat them, lost by 26 in the first round of D4. Lowell had two early wins in NorCals by 12, so it's not like they were overwhelming people, then beat Durham, a team that never played a Bay Area or Sacto team (as far as I can tell) by 17 to get to the state game, where they lost by 26.
So should Lowell have been D1, as enrollment suggests? Since the team that beat them by 16 in the SF finals lost by 26 in the first round of D4, that seems more like punishment than reward. In D5, they blew out the first-round opponent, played two 12-point games, beat a team that hadn't played much tough competition by 17 and then got crushed in the finals.
I'm not convinced Lowell was in the wrong bracket in D5, though maybe D4 would have been better. But to claim they should have gone where their enrollment put them would simply have been unfair. (Note that Pinewood's enrollment made them D5, and how do you think Pinewood does against Durham?)