Button pushing is more than a tad easier than playing the proper chords with your fingers. That device reminds me of those push button chord organs sold many years ago by Magnus and Bontempi, although, to be fair, you are given a wider selection of chords.

There really isn't much new...just a newer way of doing an old thing.

Arrangers are just a more modern (and far more portable) version of the home organs of the 70's and 80's.

Ian