Here's the best comment in the OP's link: The only exception to this rule are the ultra-high-end million-dollar "rock star" buses - but few can afford those (even the people who buy them).
And quite frankly, that's the answer. If all RVs had the quality we expect, few of us could afford to have them. So they make so that we can afford them. And we have to live with that or not have an RV.
And like your house or car, they need maintenance. It's not hard to check the seals twice a year. It's not hard to clean the roof membrane and keep it in good condition. Apparently the guy that wrote that article was expecting perfection and a maintenance free experience and now he's bitter that he didn't get either.
One thing I do agree with is comments about fit and finish. Attention to detail, the little things, would make RVs a lot nicer when new.
