CA's lockdowns were based on scientific evidence that COVID19 spreads through the air. Requiring masks was based on that evidence. As there were a lot of scientific unknowns during the past year, the lockdowns were overly broad as a matter of necessity--nobody knew how bad it could get. Moreover, CA's refusal to stick to the lackadaisal CDC guidelines was based heavily on the Trump administration's politicization of COVID19, and especially on the CDC's missteps at the beginning of the COVID19 crisis (i.e., when they were originally advising people not to wear masks...because they wanted to save them for medical workers and had neglected to make purchase orders for masks).
Requiring masks after vaccination was required for several months because it wasn't yet known how effective vaccinations would be in the real world. Once that data was established, the mask mandate ended for the vaccinated.
Also, note that the vaccinated can still get and spread COVID19, especially the newer strains like delta, they simply won't suffer severe symptoms if they do get infected.
If you don't want to live in an environment like CA where science and public health plays a role in decision-making, it's probably for the best that you're not living in CA.