I agree you won’t find a DAW as powerful, but some of the purpose built DAWs are so much fun. Loopy Pro you can build whatever interface you want via widgets.

And while VSTs don’t run, the AUv3s on the App Store tend to be much cheaper.

If for nothing else, I think it’s an excellent replacement for a guitar effects processor like Helix. Plus everything is backed up / restorable and you don’t have to suffer with a knob-based interface