Even if it's not for Intel tech, Apple offering more or different I/O on a separate upgrade card is theoretical option, should they even choose to listen to the needs of their users. The tower costs $6K+ and does not even have optical, S/PDIF, TOSLINK, or COAX audio outputs in any capacity. Apple doesn't even sell a dongle. Thanks for the headphone jack?
Apple doesn't have to sell an Apple tabled dongle directly. That isn't necessary in any way. That's is immaterial if there already is a robust 3rd party market that is already selling either such as dongle ( USB 3 (or better) and Thunderbolt ) or as PCI-e add-in cards. There are more than a couple players there.
The issue would be not so much hardware as the drivers. Apple probably has "too short" coverage there, but are also extremely unlikely to do that driver for 3rd parties. ( Apple probably could do with some seeded development funds here if that stalls for too long. )
The system being priced $ 6+ K so it should have a kitchen sink of ports most of the users don't want, isn't a good viewpoint. ( "it is priced to high for what is there but if they just threw in this alphabet soup of stuff maybe, maybe it would have the value I'd want to buy". That is just long winded this system isn't really targeted at you. Audio ports isn't going to 'save' it ).
There are more slots than were on previous Mac Pro. Folks who need speciality audio socket 52 can buy a card with that specific socket. And if already own a card or "dongle" with that simply just attach it. That is the market they are targeting.
The base price here is way too high to be aimed at pedestrian TOSLINK equipment set ups. HDMI is the common modern way of getting digital audio off of a system ( and all Mac Pro 2019 configurations have that). Apple has been dropping the older legacy audio out options for years. It really shouldn't be a major surprise that the 2019 Mac Pro moved on also.
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I had a funny thought .
I wonder if a third party company like Sonnet , Cal Digit or Newer Tech will manufacturer an upgrade card for the I/O Card slot #8 in the MP7,1 ?
At this point in time upgrade to what?
A "new and improved " USB 4 / TB 4 discrete controller doesn't exist yet. (even from Intel).
If there was a new "present in all Macs" next gen TB v4+ controller that showed up then Apple's drivers would be key interface. So wouldn't Apple be likely to jump into that space ? Is there really going to be room for multiple players here. Some folks think Apple is going to sell 100's of thousands of these Mac Pro. I find that highly dubious. If it is in the low-mid 10's of thousands then how many are actually going to change the I/O card in the next 1-3 years. Probably not that many. And if Apple steps in how many are left?
3+ years down the road and the installed base goes to multiple year run rates and Apple is still not gong to move then maybe. If Apple can grow the base of Mac Pro 2019 (and up) systems with this slot at some point it will hit critical mass to enable multiple parties ... but short term is somewhat dubious.
Regular PCI-e slot card can also go into Thunderbolt PCI-e card enclosures. The base usable system there is the vast majority of the current Mac product base ( which is 10's of millions a year. A three order of magnitude increase in total addressable market (TAM)). That TAM is viable for multiple players.