In the US, state and local taxes can cause a huge variance. Certain states are in debt for multiple tens of thousands of dollars per taxpayer more than other states, and those taxpayers will have to pay far more for debt service.
This whole FB thing is actually more nuanced than people talk about:
1) It's only for senior engineers
2) US only right now.
Essentially, this is a play to increase senior retention. California is pretty much unaffordable for most people who weren't pre-IPO or very good at saving.
Therefore, the trend is for more senior people to leave, and move to cheaper places. By allowing remote for seniors, FB have a good shot at keeping people for longer, which is incredibly important for large engineering driven tech-co's as the churn in tools/frameworks/approaches is really high, and keeping people who remember Tool version -2 is super high leverage when they come to consider tool version + 1.
I've always assumed these companies liked the senior rotation in order to keep seniority (and wages) lower. It also likely has the effect of keeping average age lower, which would make for an interesting disparate impact lawsuit.
