Well every 3 days is still more often then I wash mine tbh with you.

I cowash a couple times a week, but I only shampoo like once a week.

I guess I just thought that was typical?? Like a lot of the women in my life do at least something every day I feel like, even before workouts and stuff.

I never got the impression that it was typical. But my main examples wouldn't be exactly typical women (and one may not be one at all).

Skincare I thought people usually did stuff at least once a day.

I've tried to remember to at least put on lotion/cream/ointment at least once a day. But that's because I'd start to bleed if I don't do that kind of skin care. Likewise for my brother. I don't think I would otherwise. If you think you'd benefit from doing more than you are, then do it. As Alisu pointed out, it can be as simply as putting on some lotion/ointment after a shower to avoid drying out.