Developers need advanced upscaling techniques for the consoles.
All the best ones are working on more advanced forms of pixel insertion, they have no need for techniques which slot easily into ancient ways of using an engine ... they are more agile. TAA and even TAAU (and even DLSS) are compromises to maintain some decade old practices as long as possible. FSR isn't even a worthy compromise for AAA console devs, it's just plain bad.