chrisfromgreece I would imagine at some point yes but I think definitely not in 9.1, maybe not in current (9.99). I'm 99.9% sure that both your GPUs are supported by the Linux
amdgpu driver which I think is used as the upstream to port to the BSDs.
amdgpu is not in 9.1 AFAIK and I think the one is 9.99 is from a pretty old version of the Linux driver that may not support your chips.
So I would imagine that eventually a newer version of the Linux driver (which is open source and gets aid from AMD) and related Xorg drivers will be used to refresh the NetBSD drivers but I have no idea if anyone works on it regularly. I doubt it's a priority for developers who have to make best use of scarce resources and I would imagine favor server loads since hardware is a pretty big expenditure for a necessarily small subset of users (as obviously not every user has the same hardware).
Disclaimer though, I have no idea what the developers priorities are, I'm new here and only just today signed up for my first mailing list, the NetBSD-Users one 😄
Pragmatic solution if your desktop has space for another card is to just get a GPU that is supported to use in the meantime if the modesetting driver isn't to your liking. I have no idea what the used market would be like in Greece, but a Radeon 5450 is $7.50 USD with free shipping currently on eBay. It's not gonna run games (but neither will NetBSD for the most part) but it should make your desktop snappy. I can say that I have a laptop with a Mobility HD 5650 and it works accelerated under NetBSD 9.1 out of the box.
Vega on your laptop is even newer and less likely to be supported by the
amdgpu in NetBSD 9.99 I think, but the modesetting and llvm optimized software driver are actually pretty good. The big issue with running the software drivers for me on these thin clients is that the CPU is extremely wimpy (Quad 1.5GHz, single channel ddr3 memory bus, 15W TDP) and I also have a huge monitor that it's really nice to be able to do very high resolution on.