That's the theory and in most other states I would agree, but this is California. The priority is in getting votes period, not getting voters.

Once a ballot gets past the initial verification stage, ballots are separated from the voter and it becomes impossible to link them back again (ballots have no identifiers on them). Given California's priorities, I have no confidence in the integrity of their ballot verification. While I did still vote when I was in California, I was aware I was likely just wasting my time and that the act of voting had symbolic meaning but no practical value.

Election integrity is achieved by vetting elections in ways that are immediately obvious and verifiable by the voters, California unfortunately has none of that as a legal policy of the state.

As I noted in a separate comment, they do check whether your name and address is registered to vote.

Just because you don't understand the vetting doesn't mean it is not effective. Did you reach out to the CA Secretary of State's office regarding your concerns? If you communicated respectfully, I'm sure they would happily provide some reading materials.