Why do the metrics now tell us that he's the best third baseman in the league, when we have all watched him for 140 games and know damn well that he's the same fielder he was last year, maybe even a bit worse due to age? Last year would not have been based on reputation for anyone that watched him. The guy is clearly on a different level than everyone else. We don't need metrics to tell us that Aaron Judge has 80 grade power, in the same way that we don't need to them to tell that Chapman has 80 grade defense.
Why are Lourdes Gurriel Jr and Teoscar Hernandez given absolutely elite metrics when we have seen both for 500+ games and know damn well that they are awful fielders? Guys taking consistently bad routes to balls, while regularly botching routine plays is not something that takes a super scout to notice. Do you truly LGJ is on the same level as Kiermaier, as DRS says? I watched 2 games last week and he came in on a double that went over his head and dropped a catchable ball on the warning track. Nothing has changed with him, but I haven't seen KK do that a single time.
I don't doubt that the metrics are probably right a lot of time and have some merit when comparing players, but they are wildly inconsistent for a skill that seems to be one of the most consistent in the game. Other than rare outliers like Semien, defensive skill sees incremental gains and slow, age related declines. Kevin Pillar comes to mind as an obvious example, you could see him lose a bit each year.
Even different defensive metrics disagree wildly on certain players, like Gabriel Moreno having a 3 WAR difference based purely on defense.
I just can't buy that players go back and forth between Manny Ramirez calibre and gold glove level from year to year. You see that way, way too often for them to be completely trusted.
I'll continue to use metrics for players I haven't seen a lot of and a combination of that and the eye test for players that I have seen.