As an app developer who has had to deal with these kinds of state issues for, now, over a decade (pre-iOS touch was also happening, kids), I can only say this: so what?

Code for the case, and move on. WIMP is a baseline from the 70's that we need to move on, from. So, even if tis but a single-click, with de-bounce, 'tis a step up from the option. Shadows are an option; but if you know that you're going to be coding for Air.bar anyway, its just something you need to inform the GUI design team about, and move on.

Me, personally: I love this. I think its exactly what we need. I've had a Leap Motion on my desktop with much whimsy; that I can now take a touch-upgrade with me on my MBPro means I might actually be able to attain my desired goal of having a consistent, common, grounded touch interface in all of my apps. On all supported platforms.

I'm gonna get one.