Not a deal breaker either way. An electric fireplace or space heater can deliver electric heat just as well.Heat pumps have a bit of an efficiency advantage in a stick house however in an RV there really is no energy rebate vs. a simple space heater.
Heat pumps are effective in moderately cold weather a space heater will work in really cold weather.
A heat pump can provide more even centralized heat vs.the room to room direct heat of a space heater.