I imagine there may be users who can’t use macOS, or maybe they want the ability to upgrade storage.

The framework desktop even has a usable PCIe 4x slot available if you put the board in a different case. They sell the 128GB board on its own for $3150.

Comically, the 512 GB M3 Ultra Mac Studio that we tested isn't even available for purchase any more. The highest you can purchase from Apple is 96 GB.

And how much can you buy a 128GB Mac Studio for now? Go look. I think you'll be shocked.

A 2-year-old Mac Studio 128GB also sells for more.