For me, using it at the beach would be way too risky. The idea of even a scratch on it is almost nauseating. I still have this stupid-dumb obsession of wanting to keep my devices in like-new condition and I can’t see how that could reasonably be done if using the phone at the beach. To that end, its an excuse to have a lesser phone as well…a sacrificial lamb so-to-speak. In my case an iPhone 12 Mini. It gets the biking, running, beach, etc. choresand the nice phones get the pristine treatment.
Long story short, the ZF3 it too nice to risk the beach environment.