So based off what you just said then any survey that has been done is irrelevant because only a sample group was asked and not the entire population.
Pretty silly argument. You'd use a sample of the population to determine that, 19 times out of 20, some percentage of the population would have voted a given way on a given day, for example. You wouldn't use it to say that every single American would vote a certain way, or hold certain beliefs, for example, just as you can't say that all Klipsch speakers ever made are harsh-sounding based on having heard a few.
From the systems I remember a set of La Scala, a full set of the Reference line, my buddy's THX set, the small Palladium floor speakers, and the Icons.
So again, I do feel that I have heard enough models to form an educated opinion on how they sound.
I would not disagree that those you listed could sound bright to some listeners. IMO the reference line would be dependent on the models in that line. I owned RF7's and the only time that I ever thought they were harsh/bright was with a Lexicon pre/pro. When I owned them I wished for a little more on the top end.
I have owned three models in the Klipsch KG series and they are not even close to bright. In fact I find the 800 series B&W to border on the bright or harsh side by comparison. The 804 and 805 are somewhat bright and the 802 can be harsh at loud volumes in stereo.
IMO even the Dynaudios have some speakers that are harsh. I have learned not to judge by a brand or other's opinions. Each series within a brand can have different sound characteristics. You have only yourself to blame if you do not listen for yourself.