MSFT has a rather Draconian view of the system and with the upcoming WP10 release authors are not as plentiful for this phone. There's more I could write but MSFT is not helping by making it tough to get to market plus the pricing issues.
If you're a developer you hit Apple then Android first.
I have been trying to find out of windows is ever going to release the pop up blocker on internet as I need my phone to work and like it but you can't because of this issue. I know Android is the answer but I am one of those that happen to like my windows phone overall and really can't afford buying another phone.