It works well in California. Just had one the other morning for a 4.2.
Depending on how far away it is I’ll have a few seconds notice. This one was really close so the alert came in almost at the same time. Last year I had about 10-15 seconds notice for a 6.4.
I don’t think you know what the curve actually looks like if you think this is “behind the curve”. The majority of states have 0 paid sick leave by law, CA already had 3 days and is increasing it to 5.
https://www.shrm.org/resourcesandtools/legal-and-compliance/employment-law/pages/state-local-paid-sick-leave-chart.aspx