My project supports the Android version 4.3 and everything above.
I have about 150,000 users and on version 4.3 + 4.4 I have a total of less than 200 users who also barely use the app.
Are there any benefits to canceling support for these older versions? Maybe APK file size, performance etc…
Not really sure… you might want to ask over in the Platforms: Android group in this forum.