With all the recent changes in techno it sounds kinda dated. Quality work, but not exactly timeless.
A lot of people would consider techno to have NO timelessness. How timeless can boom-tsk-boom-tsk-boom-tsk be? Besides, regardless of these 'changes', why do people jump on the band-wagon so damn much? Why did so many artists who made such beautiful hard techno switch to the total opposite, clicky boring put my ass to sleep techno? Yeah, the hard techno of days past has pretty much been played out, but don't kill it off like an old dog you don't want anymore. That style of techno is what brought us all to this forum, keep it alive because it deserves to be alive, regardless of how un-timeless it is.

is it a rule that all should just stick to one style?
No, but it's true Metallica didn't make jazz... ? >:|