They most likely have a long-term plan to realign team boundaries with office locations, but want to minimize the short-term disruption for people who've moved around the Bay Area based on current working schedules.
There is no sign of a return to 2019 levels of Bay Area or even US share of headcount.
Around 2023 I was working at a company that was, at the time, just threatening RTO, and when hiring we had to decide if it was worth it to hire someone who (might) report to a different office in a different time zone. Which was not an issue at all a month before, when the company was still committed to being fully remote. The hours talking about it were a waste of my life for what, in the end, didn't even matter because they laid off most of the team six months later.