well, only several years ago these RVs didn't even come 'pre-wired', so you're getting 'something' you would not have had before... though it's usefulness is questionable.
also, no, not 'everyone' wants, or certainly does not 'need', solar - may RVrs simply drive from one full-hookup campground or rv park to another, never needing anything other than the normal 12v or 120v systems they already have access to.
and, many folks don't really understand the true nature of solar, they just buy into the fact that it 'must be' what they need since their rig came 'pre-wired', or has a 'connection' outside, or because they see 'others' doing it. Solar simply helps to trickle charge your battery(s), nothing more, at least for the vast, vast majority of RV owners.
It's expensive relative to other options for power, or battery charging, and the sun does not always cooperate - usually at the very time you need it.
No, manufacturers don't just 'give' you solar because it's only the additional '1/4 of the way' - they have costs involved. That cost is not small. Even if they did, some would complain that they weren't given enough, and others that 'why should they pay for something they don't even use or need', and still others would complain because they gave them 'cheap' panels, et.c, et.c,....
Add solar panels if you want, but the vast majority won't care if they do or don't. Of the millions of RVs on the road, parked in storage, or even used only for seasonal camping, never leaving the setup where they are parked, there may be 1% who have any solar.
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