I kinda agree that more technology doesn't mean better.

Personally, I think Shimano should not have put 9 speed into mass production for mountain bikes, and 10 speed for road.

The drivetrains are too fragile. The shifting isn't as precise and due to the compact nature of the cassette, rubbing will occur. Trying to get the front derailleur adjusted so you don't get scraping in your basic (most common) gear combos is an exercise in aggrevation.

With all the new suspension technology and all the adjustment controls, its very difficult to have your suspension tuned properly for every ride.

Everything is a compromise.

Disc brakes rub slightly. I've spent a lot of time tinkering with mine to get them not to. But the performance outweighs the hassle, so I continue to run discs. Sure, once set I haven't had to mess around with them, but it took some time to get them right.