I got mine at the start of the year. At the time, when I priced out a dual Nvidia 3090 rig it was coming out at $10k from Puget Systems, part of that cost was in inflated gpu pricing. By comparison, I could get an Apple certified MacPro for $7k excluding the Duo modules which still made it more expensive but kept me and the software I was already using in the MacOS camp. That logic might not work for everyone but it did for me
Bear in mind though used MacPro prices have come down some more since then along with gpu prices and upgrading with a 3rd party used or new 6900XT would still out perform the Studio on the GPU side.
The MacPro does get a lot of stick, but having owned one I think some of it is unfair. Some of the things that have value for me:
It's stone quiet. I had two Sonnet Tech 6900XT's in it instead of MPX modules, and whilst super quick, those cards are properly loud and distracting.
MPX Modules. Such a great design. Has a hidden button/lever that allows the module to be removed from the case. Naturally reviews of them focus on performance but no one mentions that they operate silently as they are just giant heatsinks.
The cpu has 64 pcie lanes, by comparison the new 13th Gen Intel I9 has 20. Half of those are used by the gpu's in my case, but that still leaves a lot to play with. Between the two MPX modules I have 8 Thunderbolt ports and 2 HDMI ports. I could use these for all manner of things and I still wouldn't be able to use them all. And this doesn't count the two on the I/O board and the two on top of the case.
The I/O board that comes as standard allows an additional displays to be attached to it along with the thunderbolt ports on top of the case. You don't have to attach displays to the gpu(s) which are lower on the case, so depending on the length of your cable that could be the difference between whether you can attach it or not. It is in my case.
The locking mechanism for the pcie slots should be universally adopted, so much easier than that stupid clip you get on PC motherboards.
Did I mention those PCIE slots? The've allowed me to install additional pcie based ssd storage (nvme and U.2 versions). Super fast and load large virtual instruments libraries instantly. All upgradable.
Bootcamp. Super quick to install and happily uses both an MPX module and a Nvidia card at the same time. Some might say just get a pc if you need windows, but it's a slick solution and means I don't have to mess with Parallels. I had Bootcamp installed on a separate PCIE SSD and when done you can use the Bootcamp utility to remove it and return that space to the Mac partition on the SSD instantly. Just a shame Bootcamp can't do Win 11.
No internal cables! I built a pc for my daughter recently, it had been a long time but my lord the amount of cable management you have to do internally. I haven't missed that.
At the end of the day you can compare apples to apples all day but the little things play a large part of the ownership experience in addition to the headlines features. For creatives the Studio will satisfy nearly all of them for sure, but for those of us who need the GPU grunt and flexibility to re-configure our systems without buying a new unit, the MacPro is still hard to beat.