Very true, neither company is interested in selling top iGPU to customers.
Coincidentally, neither am I interested in buying their monster graphics cards with hundreds of watt power consumption just to play the latest "Silly man-animal of fluid gender" FPS game.

So it shows that AMD, like Intel, is "allergic" to desktop APUs ...

Their goodwill for desktop APUs only goes as far as approximately GTX 1050 Ti graphics power. Sad. APUs could completely remove the need for any dGPU if you keep your expectations in gaming at low settings (but not necessarily ugly settings). Add to that the possibility to easily upgrade the chip by swapping in and out the socketed chip - would have been great. Imo as a custom ITX build better than a NUC (because of standard coolers, standard PSUs, etc)

But "they" don't want that. Both AMD and Intel. They don't want that flexibility for customers. Obviously.