Not EXACTLY true, though in essence correct. Yamaha brought out a revision or two of the T2 OS to fix minor bugs and update the IDC feature, didn't they?
Not exactly the same as Roland or Korg's complete overhaul of the OS for free, but still not exactly NOTHING...
What bugs were you referring to? On the whole, Yamaha's OS is so refined (alright, call it nearly unchanged!) that little that I know of exists (mind you, getting a Yamaha fanboy to admit even the tiniest of flaws is like pulling teeth
), if you are really talking BUGS.
Flawed features, OTOH, don't really count as bugs (they are when the manual says one thing, and it does something else - if a feature is exactly how the manual describes it, no matter how dumb, it ain't a bug!).