Why is Kivy not popular?

Kivy is rather flexible. It can be run on the OS of your choice, be it Linux, Windows, MacOSX, Android and IOS .

Although you might get a little bit better performance with pygame , kivy is much more intuitive framework and if you don’t aim to create a Crysis I’d go with kivy .

Kivy is an excellent choice if you expect users to operate your app on different devices and you need its look and controls to be consistent . On the other hand, BeeWare works from a codebase to produce different code versions for different platforms.

KivyMD is a collection of Material Design widgets for use with Kivy, a GUI framework for making mobile applications. It is similar to the Kivy framework but provides a more attractive GUI .

It is worth learning . It can help you to create apps more quickly, if your making mobile apps all you need is one code to target all platforms (android and iOS) and if your into android development it is easier than the android studio (I don’t know about iOS and xcode).

Kivy is a great tool for developing Android Apps . The best advantage of using kivy is that it is cross platform and the same project can be used to publish apps on iOS , Android , windows , OS x… However , it has some performance related disadvantages(as do most cross-platform tools like unity , cocos etc).