> I only don't really understand "MorphOS supported hardware is heavily
> based on ATI graphics" ... how so ?

That's what I didn't understand either. So I responded:

"But that's surely rather effect than cause. To port MorphOS you're selecting exactly those PPC Macs which have either a supported Radeon GPU or an exchangeable graphics card. With Gallium3D that table could be turned."

Unfortunately, he didn't respond to that counter-argument.