I personally would never use someone else’s hole while they’re still on that spot. There’s community holes where its pretty normal but you won’t find me in any of those areas.
If someone is off on their own away from others, moving in on them is very disrespectful. Going as far as using their holes might as well be fighting words for some guys. Like Bucky said, they may be away from the crowd on purpose.
If you’re hell bent on fishing that spot, stopping and chatting about it with the other guy is the best bet.
The it’s all public water mentality is toxic. If they beat you to it, accept it and treat it like it’s theirs. Be respectful, ask if they mind you setting up with them and more than likely nobody will get too upset.
Overall, I think less holes are drilled now with FFS than before. 50-100 hole grids used to be the normal for basin crappies, now you can see that whole grid with 4 holes using FFS, narrow in on them and catch them.