It depends on your musical ability
I think that an arranger keyboard is about playing chords
If I was to gig with midi files then I would probably have a different set-up
You have an option to go to Song Creator and ‘step record’ the chords and style parts
I think that would be better than buying midi files
To me, that would be a little bit like cheating
Better take your time to learn all the chords
It’s all about the time you put in and practice every day,
There are plenty of 3 chord and 4 chord songs around
Good luck
Pino