5G cellular is high bandwidth but very short range, so yeah they need that kind of density to maintain coverage. They installed them in a street near me and they’re placed every couple of blocks. It’s useful to think of the usual WiFi router at home: you can set up 2.4g and 5g access points. The 5g ones are faster, but have shorter range and you need to use the 2.4g one if you’re far from the router
I just started using both recently and it’s great. For the fzf file search, there’s even some extension that can show a preview pane of text files and even images!