The self contained "punch down wire" RV receptacles are peculiar to the industry. I can see some room for someone inventing a better quality self contained receptacle.
One reason for protecting the fridge............ I read on a forum earlier this year that someone was having trouble with their trailer tripping the house GFCI they had it plugged into at home. They then plugged it into a non-GFCI circuit and discovered they had a "hot skin" condition. Very dangerous. After much trial and error, they discovered that unplugging the fridge eliminated the problem, and that the heating element was shorted, not enough to trip a breaker, nor burn a wire, it even heated, but was shorted enough to cause the problems. The person posting installed a plug in GFCI in the fridge receptacle after replacing the heater element.
https://www.homedepot.com/p/Husky-Wa...=aw.ds#overlay
Warning, I have one and the description says it has an "indicator light" which is NOT correct, it has a red mechanical flag in a tiny clear window, to show when it is tripped. Very handy to have however, if you are working outdoors with extension cords and only have non gfci circuits to access.
Charles