With classical music, surely, we don’t need a band accompaniment.
But with modern music, it can be quite nice, really nice. I remember playing Your Song (Elton John/Bernie Taupin) with a MIDI accompaniment backtrack. It was very enjoyable. This was the time when the CLP150 had the 480 XG instruments… it was like the CLP775 had them, but it is now reserved to the higher end CLP785.
Nowadays Clavinova (CLP) have an audio Bluetooth input. What I could do is still possible with a smartphone and an accompaniment soundtrack on it, or with iRealPro…. The added value of an arranger feature has a lot of cost effective competition.
I may have to purchase Cubase Elements and its integrated GM sounds to transform a MIDI track to a MP3 usable with my phone, it is about 90€ far less than the added cost of CVP.
Note : with the CLP150, I have played both hand with a MIDI track. With an arranger where I would have to play chords by chords left hand, I would surely be more frustrated not to play left hand freely.