I tend to agree with you on this. It's a great idea, but not an amazing idea. And the reason is simply that we can think of what a better version would look like - polymorphic buttons.
I wonder if that's actually a good criteria for defining game changing innovation - that you can't think what a better version would look like.
I've personally been fantasizing about improved tactile touchscreen features since the iPad came out, but that didn't change the fact that it was a "game changing device". So I suspect that's not a great standard to judge by.
The fact is that every step in technology allows you to see farther ahead. To complain that the mountain you stand on isn't as tall as the one it allows you to see is ridiculous.
In my defence, I'm not complaining about it, just agreeing with the guy I replied to that I was somewhat disappointed. I was then curious why I was disappointed, and wondered whether my rationale was generalisable. It probably isn't.
I wonder if that's actually a good criteria for defining game changing innovation - that you can't think what a better version would look like.