The question is not, if there are interesting applicatins running on android.
The question is, if those applications would satisfacory run on eink reader!! My feeling is most of them wouldn't without modification to run fairly well on eink.
My opinion is, there is no shortcut to have decent app on eink. Starting from Linux A or android (Linux B) the applications must be modified to run smoothly on eink.
The intuitevily easier path (using android) might be easily the more difficult one.
We'll see in future. If someone big adopts android for eink and if developers of android applications will take in account that they might run on eink, then android is better in long run.
To my opinion there is plenty of app for linux that could run with some effort on eink. It is not that important if it is android or another Linux.