Sadly, I am still right. Before I made my post I researched it, just to be sure.
I eventually found this 254 page guide:
https://forums.guru3d.com/threads/nvidia-anti-aliasing-guide-updated.357956/page-232
Which talks a bit about that. If you spend enough time in that thread, it becomes apparent that the hack it back in did work in DX10 sometimes. By the time DX11 rolls around, it is well and truly dead.
I did not even think to look into AF settings, and sadly I do not have time right now.
Generally speaking, if there's DX11/DX12 game that has MSAA support then it has settings for it in game. There may be some rare exceptions where forcing might works but probably not among AAA games.
You don't have to. It should work in <=DX11 and generally in DX12 too. Not sure about Vulkan - I don't have any Vulkan game. For example Genshin Impact lacked in game AF setting for quite somet time. It is now available but it is still is worse than when forced through the driver. Sadly, that's quite common...
AMDs driver just says <=DX9 so I assume that it doesn't work (I've read that some have issues getting it to work in older games like TES: Oblivion these days though). They have now removed the ability to change any video related setting other than video brightness, which is quite meh. It feels like they just keep removing stuff...
What I'd like to know is that does Intels AF setting actually work. Also if their CMAA works as well as NVIDIA's driver FXAA. Tomb Raider 2013 was quite hilarious. Not only did it had horrible FXAA implementation, the SSAA implementation was also horrendous. It's impressive how bad it was.
SSAA:
Driver FXAA:
Driver FXAA is actually quite good option if there's no other option and it's better than the FXAA 3.11. For older games DSR + driver FXAA is rather nice combo these days. No need to mess with injectors either.
Personally I can live without MSAA since DSR is valid for older games. But there are quite a few games with pretty broken AF... If Intel can do that, then feature wise I could probably live with Arc. I wish that I'd stop caring about that... life would be easier.