AdBlock: The web is slightly less nice without this, but overall not a big deal. I don't mind not having it too much.
BrowserChooser: Irrelevant now since Safari in iOS 7 is so damn good to begin with. When Mavericks hits next month desktop Safari will finally be great too. Perfect!
f.lux: This one hurts. Bad. I feel like an idiot wearing these stupid orange glasses at night. I can't believe that Apple still has not implemented a solution for this. I now cannot physically use my iPhone or iPad at night without silly-looking orange protective glasses. What the hell, Apple? This is the kind of thing that makes me consider Android. Seriously. I need f.lux to be able to use my iOS devices before bed. There is NO VALID REASON for this to not be baked into the OS. The iPad is the ultimate bedtime reading accessory... as long as you have f.lux.
Apple is just too damn slow these days. Not enough software engineers. Many stock apps haven't even been updated for iOS 7 (Find my iPhone, Find my Friends). Just embarrassing. That's even with putting OS X on the backburner and focussing nearly all resources on iOS. It wasn't enough, and we're still gonna have an old-looking OS X UI for the next year. Smooth, Apple.
So yeah, I regret it. I do love iOS 7... but f.lux is such a critical utility for me. By updating my phone I've forced myself to require these silly protective glasses just to used devices at night. Bad decision.