It feels like even if Apple's DAW utopia came to pass, the iPad would still be an imperfect and less powerful option compared to a similarly specced Mac.
If you music, have an iPad, and can spare the cost of a couple restaurant dinners, I recommend picking up the USB adapter and an app like AUM ($22). There are a ton of workhorse tools available like BIAS FX 2, and a ton of apps which are just fun, like Gauss Field Looper ($7). The price/performance of this kind of setup is just out of this world. I don’t think it’s replacing the DAW any time soon, despite the arrival of Logic/Cubasis/Reason/etc, but it’s giving pedalboards a run for their money.
However, as a musician, I wouldn't perform with one, but I use forescore literally every day.
As an sound tech, I've mixed a while lot of shows on glass both as a monitor engineer and FOH for smaller stuff. My iPad is a great tool for that work. They are pretty ubiquitous amound sound techs, at least at the levels I work at.
The limiting factor is the performance software (Mainstage and Live) aren't on iPadOS, yet. Live has some bigger lifting to do to get there.
I'm a software engineer and I daily drive a 12.9in iPad pro at home...because I don't code at home (and have a work M1 for that). I originally bought the 12.9 so I could read sheet and use it as an all in one piano learning companion.
It was great for that! I did give up on Piano unfortunately and now i mainly use it as a very expensive content consumption device - which actually is still great vs lugging a 15in "work" laptop when I travel just so I can watch netflix.