The reason I brought up taxes (which might seem odd to people since compensation usually ignores them) is because they will significantly change the equation for various reasons. (AMT, RSUs taxed as short term gains and not long term, state tax affecting comp regardless of cost of living, etc.)
Ultimately, any compensation number that rolls all of this up into one number is mostly useless for actually knowing how much money you’ll have in N years, but it is useful for comparing offers, which is fine - but then these numbers shouldn’t appear without qualification in the type of discussion where personal finance is involved.
Not to mention that since this is a forum where many people are involved in startups, a 50k salary often (ok, maybe not often but I’m on 1/1) turns into several millions in a few years. Does that mean founders should claim they were making $2 mil per year? I don’t think so - but that’s the only comparison available if you use levels.fyi.