I guess what OP was trying to say is that their application as creative tools (production vs consumption) is far more limited than the full fledged PC systems that we are used to.
What? In no way, especially for drums.
The iPad Pros are credited with stopping the slide of iPad revenues - along with all of the accessories.
For specialized software, tailored to specific fields, with only the interaction elements for particular jobs the iPad can be a much better fit than a laptop. Those jobs however aren't generic enough that off shelf software make a ton of sense.
I’m not saying Office for iPad is pointless (I use it regularly, so quite the opposite!), but I do think it’s foolish to think an organisation the size of Microsoft’s doesn’t necessarily do things for obvious reasons. Individual incentives do not always lend themselves to data driven objectives.
Loss-making strategies can ultimately be profitable in a broader sense (if it increases the stickiness of the product on it's primary platforms, keeping away competitors, a strategic moat).
I don't think there's any evidence either way to be able to make any assumptions about the level of interest of the product, and whether or not that justifies it's existence.
For graphic design (typography work, layout, UI, etc) mouse and keyboard are still the best input devices. Much faster and precise than tapping on a touch screen or using an Apple Pencil.
There are Android tablets with precise pen support, but especually the cheaper ones don't have that good pen precision (jitter, lag) and also the available drawing software is not as advanced as on the iPad & powerful ossdesktop drawig tools such as Krita or Mypaint are not yet ported to Android.
So in the end I basically had to get the top of the line Android tablet (Galaxy Tab S6) to get something comparable, where the manufacturer dumped so much mone so that some got also to the pen support & it would be working correctly. And so far so good. :)
If I want to reply to an email I'll walk upstairs to my real computer rather than attempt to do it on our iPad.
As Joey Hess said[1] "If it doesn't have a keyboard, I feel that my thoughts are being forced out through a straw."
[1] https://usesthis.com/interviews/joey.hess/