[omnimus]

I am not sure what you don't understand. There is no way you can cram desktop grade cpu and gpu in such a small space. You could put laptop line of cpus + gpus there which are slower and probably shouldn't be run 24/7 (apples usecase is NAS). Or you put just desktop cpu which has ok integrated graphics already.

[izietto]

Can't you use a laptop GPU with a desktop CPU? Logically I'd say "yes", but I'm not an hardware expert, just asking

[omnimus]

You probably can but maybe it still just doesnt make sense to add it because of heat/money cost. The integrated gpus nowdays are pretty good you can connect 3x4K screens in that mac mini.

So if you need real graphic power mobile gpu doesnt help much and just for output for most people integrated is enough.

In some ways that egpu approach (if it works) is nice.