GarageBand is fun, and capable of making surprisingly complex music. Logic Pro is also available on iPad now, but it's only available with a $15/month subscription, so I haven't tried it.

For artists, there are a lot of good tools: Procreate, Art Set 4, Adobe Fresco, Artrage, etc.

Still subpar, only real DAW available is Logic Pro, the audio stack behaves differently than macOS, no support for VSTs but has support for the AU format.

A friend who I make music together had an iPad that we tried to add to the setup, in the end after some months we chucked it aside and just got a MacBook for our shared studio instead.

I had the same problem with my M4 Pro. So I sold it.