This is a great question that people were asking even 15-20 years ago, likely even before then too, but it was before my time in asking it.
Essentially, the demand for CAD on Mac just isn't high enough to justify it, especially when anybody serious about CAD wants the absolute cutting edge of hardware, and the ability to expand upon it as soon as the rest of the industry is able to take advantage of the latest GPU. Being competitive is everything.
It's never been a case of software needing to be ported. Some CAD apps have come and gone on Mac, but the demand just isn't there in terms of sales to make it worthwhile. That's not to say that there aren't CAD apps on Macs, there are, but the big boy industrial toys are elsewhere.
Keep in mind we used to run Parallels and Bootcamp in the '00s to get Windows software on Macs!
(Like, to further clarify, when I did my Engineering Technology degree, we were trained on AutoCAD (But also 3D Cad), and it was obvious then that autocad was antiquated and was soon to be abandoned en masse.
Essentially, the demand for CAD on Mac just isn't high enough to justify it, especially when anybody serious about CAD wants the absolute cutting edge of hardware, and the ability to expand upon it as soon as the rest of the industry is able to take advantage of the latest GPU. Being competitive is everything.
It's never been a case of software needing to be ported. Some CAD apps have come and gone on Mac, but the demand just isn't there in terms of sales to make it worthwhile. That's not to say that there aren't CAD apps on Macs, there are, but the big boy industrial toys are elsewhere.
Keep in mind we used to run Parallels and Bootcamp in the '00s to get Windows software on Macs!