I think the problem arises because most Org hackers are Emacs hackers, but writing apps is a totally different domain. I went at it once, full of beans, and was defeated by Java, and the general app ecosystem.
Each uptick in my emacs lisp ability has had an immediate effect across my entire computing environment, and that has made learning lisp a practical endeavor, despite my not really being a programmer. Learning to write Android apps... I'm going to need that once, perhaps twice, and it's not worth it.
The same method of operation (native emacs) on Android is much more convenient, by using a Linux chroot (Linux Deploy). Android users also have it much more easy in the org compatible App department, they can use Orgzly!
And Google Keep is fine for shopping lists.