Apple's attitude to third party devs aside the system is broken for professional work from the get go. It's entirely locked down and siloed.
I recently had to fix some issues with my parents iPad and it was a hell of a eye opener into why it's a terrible idea to rely on these devices at all.
So my mother does painting as a hobby and recently has got into using Brushes (2010 Apple Award Winner), at some point her iPad decided to update itself to iOS 10 (note you cannot disable updates anymore, only postpone them) and was a bit surprised she could no longer open any of the paintings she'd made in the app over the last 3 years. I tried to update the app, it's the latest version
I tried to open them > crash, tried to email them to myself > crash, set up a dropbox account to sync them off the device > crash.
I look online and find this app despite having won awards and being used by famous artist David Hockney is no longer updated, but good news it's open source so someone else has taken up the job of updating it to run on """modern""" iOS, so I install Brushes Redux, it works but none of her paintings are in it. So 3 years of work is on the device, we have a version of the app that should be able to open that work, but we can't because all files are siloed within app.
Long story short after 5 hours of trying to sort this out I finally used a very dodgy looking app to pull the hidden files out of the old brushes app and into the new one. Let's just hope Hockney manages to figure this out too or millions of pounds worth of artwork might be lost for good.
I use software in my day to day work way older than this brushes app but this scenario will never be a problem in my work because my OS isn't locked down, siloed and can disable updates.