It's starting to get to me too. I am on the verge of calling it quits for Windows 10.
Over the weekend I went out to a bar I usually go to. They have one of those Internet-connected jukeboxes, where you can use an app to pay and select songs, see what's next etc. Naturally, there is no app for Windows Phone (or Windows 10), but I'm used to it, so I put in my dollar bills in the machine and select on the screen in the bar. Not that big a deal, but it's been annoying anyway. I have a Moto E at home that I sometimes take to places where I know I will want a particular app, but I didn't have it with me.
This time though, we were sitting around at the bar and decided to do a little impromptu karaoke. Everyone (except me, of course) pull out their phones to check what is coming, and select some songs. I, of course, had to walk over to the machine and insert bills.

But what came next was really irritating and symptomatic of the app gap. One guy starts a karaoke app on his Android phone, that automatically syncs the lyrics to what is playing on the jukebox. That was really cool and fun, and we had a blast.
THAT is what the app gap is. It's not just the Snapchat and the banking apps and the store apps, though it is all of that too. It's the smaller apps. The fun ones. The ones that enhance your life in some way. Why would I pay hundreds (thousands, if you count subscriptions) for a new Windows phone, when I keep losing out on things like these?
My Verizon contract will be up in a few months. I was hoping that Windows 10 Mobile will have the bugs worked out by then, but when things like these keep happening, I keep wondering why I should even bother. I love the OS, but at this point the app gap is worse than it has ever been. It's just no fun anymore to have a Windows phone.