> Doesn't the sandboxing and limited access to the file system get in the way?
Why would it get in the way? Any video editing software on it's going to be designed with that in mind, and will share with other video-related software just fine. Lots of desktop video editing software (Premiere, to pick one) start with "OK, step 1, import all the clips/videos for this project into this program" so even in the worst case it's gonna look a lot like the same workflow as video-editors are used to, and those workflows exist and became the norm on desktop before iPads even existed.
> Can you export video to non-Apple formats
Of course. Why wouldn't you be able to?
> collaborate with other people via a version control system
Never seen it for video editing, including when I worked at a video production company, though that was years go so maybe version control's normal even for amateurs and small shops now? If it's around and popular I'd be surprised if there's not "an app for that" or it's not built-in to some of the higher end editing software on iPad. If things still operate like they used to then you're talking a NAS shared over SMB for largish projects, or Dropbox for smaller ones, for collaboration, probably, and both those are fine with iPads.
Not sure that they do. They could, but I don't know of any significant video editing plugin ecosystems on iOS. Stuff's too rich for my blood—$200 to make overlay text look a certain way? $400 for a noise-reduction algo? Not for me and my casual stuff. Again, if you want actual pro software, you're looking at one of a couple desktop application vendors, that's true. If you're looking for pro-tier software for home use, and learning that pro-tier software is your main goal and/or you actually need what it can provide, then you're probably talking Adobe Premiere, specifically, and yeah, that's desktop only (and about $250/yr). If you just want to learn the process and techniques of non-linear video editing and put together (potentially quite good) edited videos or films, the iPad's capable enough (with the benefit that, in the original use case posted here, it's also a damn good drawing tablet and you can use it to shoot your videos, too, again, if you don't have actual pro-level needs), but I wouldn't argue it replaces a desktop with Premiere, for a bunch of reasons including that everyone assumes you've got Premiere (and often Aftereffects, too) available, when it comes to plugins.
Why would it get in the way? Any video editing software on it's going to be designed with that in mind, and will share with other video-related software just fine. Lots of desktop video editing software (Premiere, to pick one) start with "OK, step 1, import all the clips/videos for this project into this program" so even in the worst case it's gonna look a lot like the same workflow as video-editors are used to, and those workflows exist and became the norm on desktop before iPads even existed.
> Can you export video to non-Apple formats
Of course. Why wouldn't you be able to?
> collaborate with other people via a version control system
Never seen it for video editing, including when I worked at a video production company, though that was years go so maybe version control's normal even for amateurs and small shops now? If it's around and popular I'd be surprised if there's not "an app for that" or it's not built-in to some of the higher end editing software on iPad. If things still operate like they used to then you're talking a NAS shared over SMB for largish projects, or Dropbox for smaller ones, for collaboration, probably, and both those are fine with iPads.
> easily import footage from non-Apple devices
Sure, why not?