I think HBP and walks do factor into the pitchers FIP though. But that's more on the pitcher stats.Good catch.
I did not know that. I was skeptical enough that I had to Google it.
“It is the ratio of the batter's times-on-base (TOB) (the sum of hits, walks, and times hit by pitch)”
Interesting that the the mistake by pitcher hitting the batter isn’t the same as a mistake by a fielder.