About 50% of my high school and college friends have left CA. None have come back. Most of the rest are in the Bay area, and none of them talk about leaving much. Bay area weather, especially in summer, isn’t why they are staying.
Alot of the people I have heard of wanting to leave CA are either my age (mid 20’s) or my parents age with the kids gone. My parents have friends who are selling their house, buying a small condo, and moving to Idaho. Spring, summer, fall and ski weeks in Idaho; Holidays and March in Santa Barbara. Plus the taxes, and reduced crowds and clean living and such.