When you combine an open wound with sunscreen, road grit containing petroleum byproducts, and standing water from farms (all extremely common) you have a very serious hygiene problem if hair prevents you from cleaning it properly in the field.

Seems like an edge case. I normally don't have all of those at once. If I did I would indeed consider shaving around the wound before cleaning, sure. Never happened though.

Yeah, an edge case. Because you've never experienced it, it didn't happen /s. As I said, all extremely common, at least in my experience. Getting sick on "farm backwash", usually by water bottle, happened semi-regularly. Sunscreen dripping into wounds from scraping veg and rocks along a mountain bike trail, that's a special hell that I'd be happy to describe to you. It's very real, especially if you're on a multi day trip without access to services. Which is a thing people do, btw.

Back to the OP, hairy legs makes things harder for long distance cycling. Especially multi-day cycling. The level at which this bothers you is a personal decision of course. I'm an average amateur mountain biker and I don't bother shaving. But I only ride 2 hours at a time! If I was going for longer trips ... yeah definitely, leg hair is a liability.

Never had this issue in my life, and I am almost forty. Seems like a big stretch.