It has absolutely nothing to do with the ability to export (or the lack thereof). Some people are against band-specific games, period. They think that all they do is over-saturate the market. (After a certain point, I'd have to agree.)
Regardless of how influential the Beatles are, if you're against band games, you're against band games, and thus Harmonix has done wrong by you.
Well, that's a reasonable point at least, even if I were to disagree in this case.