At the very least there should be a separate category for games verified to work offline. It would be easier to tolerate if it was a generic Proton compatibility rating, but it's not, it's a rating for how well it works on this handheld.
A hotspot is hardly a solution. If I'd be willing to drain my phone battery in travel, gaming on a phone is an option too. For me saving the phone battery is one of the primary advantages of a dedicated gaming device.