yeah it's easier when it's a character that switches a vowel since vowels are more used. also, i'm not a native english speaker so that might make it harder for me too.
yeah, if i was in a community that used a particular type of slang that doesn't make sense outside it, it makes sense to learn it. but, switching letters that already work as is doesn't make any sense if you're gonna do it everywhere
most people won't want to learn about FPS game slang if all they play is stardew valley.
happens every time