Hotspot is more of a convenience measure that's intended to be used as a workaround to provide WiFi connectivity when an actual router isn't available. It's not supposed to be a permanent substitute for a router with broadband connectivity. A smartphone hotspot not only has the battery power limitation, but very sparse, barely adequate networking/routing capability, and limited coverage range, the tiny antenna in a smartphone can't compete with the larger antenna(s) in a typical router. Use a hotspot as a temporary fix, get a router if you need a basic local network.