Most states have the voting results in a few days. Except for California who takes weeks to count and translate all the undocumented ballots.
With millions of undocumented voting and counting all the dead folks who vote in California, it’s a long process counting all these ballots. California can eliminate the wait tomorrow.
If California had only the legal folks voting at the polls where the machines count the votes, the 30 days or so would not happen.
Also with partisans sitting on the ballots for 30 days is a recipe for fraud.
Most of the state’s 22 million registered voters cast mail ballots — and to an extensive review process that requires more than placing a ballot through a machine.