I think that (aside from those who opine based upon only experiencing one side of the refrigeration genre) one of the discussion issues is based upon the differing styles of RV'ing.
You have one type (I call them Smoke Sniffers) who prefer the more primitive "camping" style with very few luxury resources, versus those who prefer the comforts of home with the only substantive difference is that it is mobile. This is our hotel.
For example, some have no problem stretching their fresh water supply for weeks. Alternatively, we consider showering morning and evening to be a basic commodity (and with unlimited hot water), fresh towels every day and laundered sheets at least 3x's per week.
Once those differences are defined, and establishing that some do not, and have no need to consider "battery life" per se, it makes the choices and options more clear.