There’s a large ecosystem of iOS music making apps and the iPad is actually an excellent interface for some applications, e.g. a kaoss pad.
For instance have a look at what Korg and Moog have available in the app store. Or check out drambo.
I think the "no windows" and sandboxed apps/files paradigms are very limiting for pro work.
And you really need lots of customisable keyboard shortcuts for most pro work, most iOS apps are extremely lacking in this department.
I work primarily with Logic (been using it for 20 years) but the form factor of an iPad is pretty nice - it fits perfectly on music stands and laptops don't. If Macbook screens would tilt 180 degrees, all the way flat, you might be able to use them on music stands too - but they don't.
If you are both playing and recording a real instrument at the same time, having the iPad on the the piano/music stand in front of you is very useful. Many people use Logic Remote on iPad on the stand, and Logic on MBP for actual recording at the same time. But not sure why you should need two devices.
Touch screen is nice for some things too, like mixing or quickly toggling things.
AUv3 plugins are meant to be able to run on both MacOS and iOS in the near future (this has caused some concern in the plugin dev community, because of different pricing models). Just in iOS they are apps you install from the app store, because everything that executes code needs to be a sandboxed app in iOS.
In any case, I am still waiting for Logic Pro or Ableton to be ported to the iPad.
Actually I was impressed with what people do in GarageBand on ios. Unfortunately I haven't found anything comparable for Android. Only ridiculous $20/month apps.
Google would have to rip the heart out of Android and fix it for real time programming properly like OS X did way back in like 10.2?.
However, don't get me wrong, iOS isn't great--it's just at least possible. The fact that you can't actually send a defined packet (just a bag of bytes and you don't know how many until the call--"HAH! HAH! You device decided to prioritize something in the OS and your latency just quadrupled--sucks to be you.") to the Audio system on iOS is infuriating.
However, at least it's possible on iOS. On Android, not so much.
Didn't know. Looks like I'm little closer to replacing my android with iphone
2)The form factor of an iPad makes more sense in my music setup, in that I don’t need to haul podium or standing desk on stage as well as my instruments.
3. In producing tracks, most of my time is spent twiddling knobs, adjusting levels, etc, rather than dealing with external audio interfaces or doing fine grained, fiddly things with a mouse. But now iOS supports a mouse, so I could even do that...
For instance, an iPad would be a great place to experiment and get an idea down, and then you could bring the idea to your other, more professionally oriented tools.