4G/5G coverage has gotten much better over the last few years but plenty of places I go with my RV its not great (usually in the mountains both east and west). Also there aren't great unlimited plans for jetpacks/hotspots/routers very expensive or caps.

Honestly if your serious about reliable access you want multiple ways online so Starlink + Cellular + WiFi wan would be a good way to go, maybe even two cellular carriers.