nostr:npub1j46f9va5qdrmamcwmncew7g8mwekgma386dhws6k04fsnlkqpcpsj23gm7 WiFi uses less power and generally has lower latency, so I prefer it over mobile data. Coffee shops can also have areas with poor cell reception where a WiFi router can extend to.

As for coffee shop camping, not sure if it'll change any time soon. Some people just want to get out of their rooms and go anywhere and be among people, even if they remain glued to their laptop/phone.