The Riftbreaker beta notes make this "it's not AA & you're not necessarily avoiding the work that would lead to a near-free DLSS implementation" clear:
"-support brand new AMD FidelityFX Super Resolution technique[...] We are very happy with the results, and adding this technique is highly beneficial to players with less powerful PCs. Oh - it works on all GPUs."
"-We have added a temporal anti-aliasing technique to the game. It looks infinitely better than FXAA. This setting is always enabled."
40%+ (by hwsurvey numbers) of Steam's 120m active users are currently using nVidia 10 Series cards. That is a huge audience that nVidia need to sell new RTX upgrades to in the coming years to make RTX-only features make sense on PC (the same way GameWorks features used to be an acceptable target for most of your PC audience). I get not jumping on DLSS while RTX cards aren't smashing down the top of the hwsurvey, but if you're implementing TAA then you're very close to hooking up the DLSS dlls.
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