A top-spec Mac Mini is pretty beastly at $1500. I have no doubt it would chew up and spit out the vast majority of workstation use cases. 2.6 GHz Quad-core i7, 16 GB RAM, SSD.
The only thing I can possibly imagine would be some seriously high-end 3D rendering or massively parallel simulation software.
To the OPs point, there is zero reason to get the Mac Pro over even a Mac Mini.
Seems like there's a hole in Apple's lineup. You can't get a discrete GPU without a monitor attached (iMac) or spending >$3000. Not that it matters much for Illustrator, Photoshop, etc. which are not GPU-parallelizable anyway. At least not yet.
These best part of the post is Tim Bray's response, where he says he would keep PUT and DELETE because they're idempotent, but declined to defend the rest.
GET and POST already have widely observed distinctions in how they should be handled. For example, try hitting refresh on a page that was arrived at via a POST request. That behaviour is pretty much common to all browsers.
His point was that at minimum you still need a GET and POST for read and write. So comparing the numbers against bike-shed implementations is moot. Of course the number of reads will be significantly higher.
The only thing I can possibly imagine would be some seriously high-end 3D rendering or massively parallel simulation software.
To the OPs point, there is zero reason to get the Mac Pro over even a Mac Mini.
Seems like there's a hole in Apple's lineup. You can't get a discrete GPU without a monitor attached (iMac) or spending >$3000. Not that it matters much for Illustrator, Photoshop, etc. which are not GPU-parallelizable anyway. At least not yet.