Over the years I figured out that developing an app targeting a particular device is not a good use of your time. You're probably just working for a particular

Over the years I figured out that developing an app targeting a particular device is not a good use of your time. You're probably just working for a particular company (Google, Apple, MS) for almost free. The best approach is to use a language that is as free as possible from companies (C++, Common Lisp, for example) and develop your code independent of the device. Then, if you really need, pay somebody else to create a UI for a particular platform. This may be more difficult in the short term, but your code will at least survive for more than a couple of years and you'll not go crazy.