Depends on the software you use. For scientific computing, maybe.
For other tasks a Mac Pro would be used, no. Logic Pro, for example, is not cross platform. Neither is Final Cut Pro. And even if I depend on something like Adobe CC, most multimedia pros prefer to use it on the Mac, because of other benefits of using OS X.
>And wires dangling everywhere? To get anything other than comedy storage, you're going to need a pile of lightning devices hanging off it.
Or just a cable and a NAS.
But that's the outside, which is a given that you'd need multiple disks. Ever seen a video pro using just the internal HDs on his Desktop machine? Each project usally takes a whole disk by itself. Nobody uses the internal disks for 4K work.
>And don't give me all that crap about Apple being tried and tested - last MacBook Pro I had was totally unreliable.
Sure it was, as were several other units from the 1-2 million sold of the same MBP production run.
Now lets see how many unreliables you'd get from 1-2 million different self-built PCs.
That's the comparison that matters.