This is such basic computer industry knowledge that it's on
you to provide a source refuting it.
Apple obviously feels there's a large enough market for desktops to offer a mini, iMac, iMac Pro, and Mac Pro. But you're suggesting there's isn't a viable market for a Mac that's some version of those four? Something that's... hmm, let me see... a mini-tower with a couple PCIe slots, Intel Core... you know, basically something like the
tens of millions of desktops that Dell, HP, etc. sell every year?
Okay, as usual around here, this discussion is headed into the surreal where the people who are the least knowledgeable think they know the most. Doesn't make for interesting or fun discussions. Best of luck to you.