Apple has been tightening the screws on "you don't actually own this computer" for years, and in that context, the Mac Pro no longer makes sense to them as a product. https://9to5mac.com/2026/03/26/apple-discontinues-the-mac-pro/

The Mac Pro existed in a niche where an Apple customer wanted some feature _not quite met_ by any other product. The Mac Pro enabled that: expansion, extra compute power, graphics, etc. Honestly, it's too small a market to matter, but pushing your customers into competing platforms never worked out well.

Apple discontinues the Mac Pro with no plans for future hardware - 9to5Mac

It’s the end of an era: Apple has confirmed to 9to5Mac that the Mac Pro is being discontinued. It has...

9to5Mac
I used to joke that at some point Apple would stop caring about developers so much that it would no longer build a computer capable of developing their own OS. I guess that sets the lower limit of the "power user" products.