>> perhaps it would make more sense to focus on available modern Radeons
>> and skip the models in-between.

> For the majority of MorphOS systems in use today (which are primarily AGP
> based not PCIe) it would not.

Then why develop new graphics drivers for MorphOS/PPC at all? The last Radeon AGP GPUs are in the R4xx series, which has long been 3D-supported. The last AGP-bridged Radeon PCIe GPUs are in the R7xx series. So let the MorphOS team add 3D support for R6xx/R7xx and be done with graphics driver development for MorphOS/PPC, right?

> what would you recommend the developers focus on?

Assuming significant work hasn't already been carried out for GCN1/2/3 driver development, and based on my list there, I'd recommend focussing on GCN4 drivers. On the other hand, taking into account the effort and time needed for graphics driver development carried out by a tiny team, as well as the prospect of MorphOS/x64 (there are no AMD APUs with GCN4, except on gaming consoles), focussing now on GCN5 or even RDNA may make sense.

> If the future focus will be MorphOS x86-64, I'd suggest we consider
> something that is compatible with AMD's APUs.

Ignoring old TeraScale here, that would be GCN2, GCN3 or GCN5, then. Or RDNA for upcoming APUs.

> Intel based hardware would require a discrete video card to maintain Radeon compatibility

Yes, it seems the announced Intel CPU with on-chip AMD GPU went nowhere ;-)