It's kinda amazing at this point, how long the actual Pro's have gone without having a TB3 product to purchase, or upgrade option..(yes I know, iMac Pro is an option, but then again, different product group)
Also, I can't believe there hasn't been someone who's figured out to add TB2 or TB3 to the old cheese graters... Buying a cheese grater at this point feels so archaic to me, as much as building a PC does because all I want is a super fast, super reliable Mac OS system, and I need fast I/O, don't need a screen, and I don't want noise or throttling, at all ! Only bright side is there is only a few TB3 sound cards available and none of them are what I'm looking for, so I'll have to go with a TB2 so in that regard the 2013 Mac Pro would work...slow HDD though and single core performance is meh (again, on paper...maybe the lack of throttling will actually mean single core performance will be tolerable...not super happy about paying a cars worth for "tolerable")