Agree, I think it will be limited. However, I could see a niche where it’s a good way to play your tracks live. Maybe you’d have to bounce some tracks in advance if they aren’t iOS compatible for whatever reason.
I want to interpret this charitably, but I've travelled with touring musicians before (even Mac-obsessed ones) and none of their setups are iPad-ible. You might be able to get it to work with a 1i1o DAC for clean audio output, but... genuinely nobody I know would bother with that. The requirements for live performance are brutal, even this standalone Push would be borderline suicide to rely on for a show.