It is because an inverter that cost 50 grand in 1992 now sells for under 2 grand and is more fully featured.
For example, the (large) hybrid inverters from Victron and Magnum allow a smaller generator to be used and/or allow the eco switch to be turned on, saving fuel and frustration.
Now that led lighting is inexpensively available for 120 volt fixtures, I could "see" an rv that doesn't have any 12 volt services at all, instead relying on an inverter coupled with a large high voltage LI battery bank. Other than space heating, propane need not be used. Or a hydronic heating system for space and water could be used. Fewer systems mean fewer parts to fail.
Until I was not full time I survived very nicely for 5 years without a generator, even running the roof air for short time periods (2 hours). I still wish I had redone the solar system instead of caving in to the (dark and noisy) generator side. Now that I have the generator it doesn't make economic sense to go 100% solar.
