There are many people who for one reason or another are scared of propane.
Thus you can buy "All Electric" RV.s
I personally do not recommend it. but you an do it.
I do however agree that choice is good. thus it is good they give you that choice.
Why are people scared of propane?
If you mix propane and air in the proper Ratio and introduce a spark BOOM.
I've met folks who mixed them in .. Different... Rato and walked away uninjured when the "POOF" happened. But I do not suggest you try it.
I have lived with Propane. or natural gas (Same dangers) most of my life. and It's been a long life.