I suggested an alternative semi-standardized metric that still wouldn’t describe everyone perfectly, but I suspect would do a better job than the one used. I don’t think its weird to use one. I think the one chosen is weird, even if I acknowledged one of the reasons why they probably used it (easy of data). Current spending would still be a terrible estimate for the FIRE-types who work in HCOL places and move to LCOL places for retirement, but I think it would much better account for ordinary 25th percentile income households who live paycheck to paycheck. But I doubt Vanguard really cares if their metrics are useful for poorer people who live paycheck to paycheck since its obvious they’re not going to have enough anyways and not exactly their target demographic.