It's really a little silly.
We've flown on lots of regional aircraft, including CRJ70s, and I've never seen anything like what the OP on Anet describes.
Yeah, United does tend to stretch these things out to fly routes longer than what most folks expect on a regional, but if Canadair (Bombadier) didn't intend them to be operated on those routes, then the aircraft would have neither the range to make such flights nor the useful load to make such flights with almost all of the seats full.
Of course, if pax would have the sense to look at the aircraft they're getting for the fare they're paying, they could then choose the greater lav availability of an A319 or 73G and travel in greater comfort.
On any typical trip, we usually prefer regional aircraft, since there are no middle seats. Heck, on the left side of an ERJ, there are no seats to either side of you.