I'm definitely glad that FSR isn't bound to a brand or model, but DLSS just does so much better.

Not sure if you haven't kept up with the current-gen AMD cards, but FSR 4 is roughly halfway between DLSS 3 and DLSS 4 in overall image quality (i.e., it's good, but has some specific strengths and weaknesses compared to DLSS) and doesn't run on older-gen GPUs. With FSR 4, AMD gave up on the hardware-agnostic upscaling approach -- I guess because the quality just isn't there -- and worked with Sony on this new approach that uses their own hardware "AI cores" the same way Nvidia uses the equivalent cores for DLSS.