What a shame a vast majority of them are total sheet

In fact, it's even worse than that. The sorry situation with two app stores full of crap but barely a useful app in sight nearly three years after the release are the best testimony. If it so easy to find good apps, then why aren't the app stores full of them?

Even if you do manage to find sources for something useful in the ocean of rubbish, building it on Sailfish is NOT as trivial as you suggest. Two reasons: 1) Wayland; 2) QML. Gone are the times when I could take 8 years old sources for a desktop application, run 'make' on my N900 and off we go! On Sailfish, even sources made for its direct predecessor, the N9, no longer build. Which is at least part of the reason why we still have only a fraction of the already tiny set of N9 apps ported to Sailfish.