Don't know if it's a "big deal" or not, but I know lots of players who are less than true to themselves, assuming that they even have a self to be true to, which is far from a guaranteed quantity...
I think the main issue is integrity, does somebody have it or not. With a popular figure like Brubeck, there's always an element that will say/shout/refuse to believe anything other than that they've sold out or some such, because how else could they become so well-liked.
Well hey, some people just got it like that. They do what they do and people dig it. And some don't gt it like that. Not everybody who is popular has integrity, and not everybody who has integrity is popular. There's really no immediate/direct correlation. Given all the hype invested in convincing the marketplace otherwise (both ways), it don't hurt anything to sort out who's who for those who might care.