Both, plus the fact that significant new tech infrastructure projects like the Windows Runtime are (mostly) restricted to Store apps. I'm not anti- app stores

Both, plus the fact that significant new tech infrastructure projects like the Windows Runtime are (mostly) restricted to Store apps. I'm not anti- app stores or declarative UI in general, and I think things like standardized sandboxing would be great for many desktop apps too. But a platform that places you at the whim of a single distribution path, and cripples portability to boot, isn't worth it.