In these cases, it still seems that tablet-based tools are very much 'secondary tools', more of a sketchpad to fiddle with ideas while on the move, rather than 'production tools'.
Then there's the whole dealing with lots of files and version control side of things, essential for working as part of a team. Think about creating (and previewing, and finally uploading) a very simple web page, just HTML and a couple of images, entirely on an iPad. While it's probably quite possible these days, I suspect the workflow would be abysmal compared to a 'proper computer' where the file system isn't hidden from you and where you're not constantly switching between full-screen apps.
And that's before you start dealing with anything with significant numbers of files in deep directory structures, or doing more technical image creation (e.g. dealing with alpha channels). And of course, before testing your webpage on all the major browsers. Hmm...
There are so many artists who exclusively work on their iPad. It does seem cumbersome for a whole studio to use iPads, but they can be a powerhouse for an individual
But nobody is using iPads as a sole production tool. It's part of the production tooling but it's not exactly an essential part or a part that can't get rid of or replace easily, unlike a "real" computer.
It's rather disingenuous to pretend that an iPad can be sufficient. At its price tag it is still a rather extremely expensive accessory and people pretending otherwise are just full of it. There are enough reviews/testimonies saying as much (even from the diehard fans) for it to be an obvious fact.
Then there's the whole dealing with lots of files and version control side of things, essential for working as part of a team. Think about creating (and previewing, and finally uploading) a very simple web page, just HTML and a couple of images, entirely on an iPad. While it's probably quite possible these days, I suspect the workflow would be abysmal compared to a 'proper computer' where the file system isn't hidden from you and where you're not constantly switching between full-screen apps.
And that's before you start dealing with anything with significant numbers of files in deep directory structures, or doing more technical image creation (e.g. dealing with alpha channels). And of course, before testing your webpage on all the major browsers. Hmm...