I’m confused what they think they’re washing off.
A LOT of kitchen practices in families are passed-down traditions, with a lot of people not really knowing why they do the things they do.
My Filipino family-in-law washes their cuts of meat, which yeah is entirely unnecessary and I always wondered why they do it, then I traveled to the Philippines and saw the town where they lived, and most of the local butchers hang fresh cuts of meat up on hooks, uncovered, right next to busy roads and sidewalks.
I genuinely don't know how everyone there hasn't died of acute food poisoning from the unrefrigerated meats in high heat and humidity, but they at least like to wash off the road grime and dust.
People who are obsessed with some physical quality about themselves always make whatever the issue is, like 1000% worse than if they just left it alone and lived normally.