Bad Anti-Aliasing
Currently, the only Anti-Aliasing options are via FXAA, TAA, and whatever is packaged inside FSR and XeSS. I never tested XeSS, but so far, FSR native's anti-aliasing functions work extremely well, with no noticeable aliasing at the cost of visible ghosting, as shown in the video. This is almost unavoidable with any upscaler and can be avoided by turning off the upscalers and using a dedicated anti-aliasing setting.
Problem is, both FXAA and TAA are implemented poorly, with aliasing being quite noticeable. FXAA is outdated and leaves a lot to be desired but with low performance cost, which I can understand is for low-end users. TAA, on the other hand, is the industry standard, and is quite good at its job. The TAA definitely needs to be looked at and adjusted. Ideally, it would be wonderful if DLSS and DLAA could be added, along with SMAA and MSAA.