The standard music production tool is still Pro Tools, which does NOT run on an iPad. Neither does any leading DAW. All require a PC/laptop. Sorry, I know of -0- pros using GarageBand.
It's true that no client really cares how you make their music... until you've been commissioned to write a virtual orchestral score and you deliver a turd that was made on an iPad cuz that's what your teacher and school friends use... "But, but it's awesome for loops 'n stuff!" Yeah, you'll be doing just "fine" until you're stretched beyond your iPad's capabilities, which will happen very quickly in the real world.
No, the schools are doing students a huge disservice if they purport to prepare them for the real world with inadequate tools. And they're cocky in their inadequacy. They're about to get their ass kicked by reality, and doubly so with the attitude.
I can also argue that the the medium isn’t as important as the skills when you consider that not everyone learning coding or music making or video editing is going to work in those respective industries when they enter the workforce.
Take video editing for example. There are a lot of steps involved. From planning your script to preparing a storyboard to illustrate the flow to handling the camera. Editing the final product is but a final piece of the puzzle, and so long as it gets the job done, does it matter if the video was done using movie maker, iMovie on an iPad, or Final Cut Pro on the Mac?
Same with coding. I could rather focus more on the problem solving mindset and how that could be better applied in real life, then rush into dragging blocks around in scratch right from the get go.
Likewise, for writing, does it matter if the composition was drafted in word or google docs, so long as it is a good piece of work? If anything, google docs makes managing it much easier, from the ease of sharing to better management options via google classroom.
Same for music creation. Tools are going to change, especially when you are dealing with younger children who won’t enter the workforce for another 5-10 years. If you ask me, nurturing the love for music and the skills being music making is more important than mastering Logic Pro or whatever the flavour of the month is. It’s just a tool, and one of many to boot.
There will always be time to learn a particular piece of software. I wouldn’t put too much weight into having to master any one particular app by a certain time.