It's so interesting watching my wife play, she plays nothing like me and makes tons of I would call "mistakes" but I mean she's doing it her way
When I go out I always go well equipped, pain meds, gun, melee, maybe some snacks, if I'm gonna take out a a blood plague I make sure I have Explosives but she'll just roll out to take out a plague heart with no strap and no explosive
I always maximize storage space by completely emptying my pockets and loading rucksacks into cars but she does it haphazard
She has some characters that aren't specialized even though they're all leveled up
She's having a rougher time than me but she's still progressing, destroying plague hearts etc and she's having a good time so I can't knock it though
On topic though: you only get an add to skill if you are currently playing as that character right? I wish you could choose who performed an act so that you could choose who gets the skill upgraded