I've accepted WAR, because it's designed to evaluate a player's overall value based on a combination of offense and defense. An issue for old-timers like me is that none of the WAR sites use the exact same formula, and even if they did, it's too complicated or time-consuming to calculate for the average fan (unlike counting stats or batting averages).
Both Fangraphs and BB-Ref caution that WAR is an estimate and that players shouldn't be definitively compared to the tenths place. And yet, isn't our whole concept of numerical values based on totals?
And could someone please tell me why past WAR changes? Everytime I look at the 2018 Red Sox, Mookie's WAR is different: 10.7, 10.6, 10.8... and that season is still in the past.