It's 7:30am, and I have a presentation coming up. Here is a glimpse at the endless string of limitations you run into trying to get an iPad to work as your only computer, encountered in just one morning.
-No way around iTunes DRM telling you you're not authorized to play it
-Can't extend your workstations display onto it without Duet melting
-Can't play a movie on screen but export the audio to your iMacs big speakers
-Can't play a movie on mute and listen to music at the same time
-Or play an audio book and put a little music on in the background
-Or play any two audio or video sources at once
-Can't Import and edit films not shot on the device
-Recognize your Skype Number as your phone service, and enable the phone functionality of iOS still included but hidden on the iPad.
-Apple Maps still can't plan an efficient multi-destination route
-Still drops its maps if you go off route and then gives you a blank screen to navigate from after that
-Once you're out of town and it drops cellular, it reports "No Service" indefinitely until you reboot the device in range of a connection.
-Push Email that doesn't update for days until you manually fetch it.
-Podcasts that don't download until you manually refresh them the minute you're running out the door
-Still no even basic 3D Modeling apps
-iPad Pro + Pencil = Still too laggy to draw in vector format any better than a pogo stylus.
I’m in the camp that agrees that using an iPad as your only computer is challenging, but I think that many of the issues you’ve experienced would not be issues for the majority of iPad users.
Playing an audio book, plus music at the same time or playing a movie on mute, but with music in the background are not issues that I've ever had or even heard of anyone else ever posting an issue with here on the forums since I've been reading them, so I think those might be pretty niche use cases.
iTunes DRM is certainly an issue if it's not working for you, but again that seems like an issue that most people don't have (at least based on the number of times I've seen the issue posted here on the forums) and is likely not an ongoing concern for most people.
Skype works on an iPad, but it won't work through the iPad's iOS phone functionality, but that's not really an issue that would go away if you used a regular computer instead of an iPad, which is what this post originally asked about.
I'm not sure on the editing film content not shot on the iPad, but I'm certain you can import films through iCloud, as I've done it myself several times.
Apple Maps and Podcasts issues are related to specific apps, not to the iPad in general. There are plenty of aftermarket apps for both functions that you can use to eliminate those issues.