Everyone releasing this feature because of a lack performance.
Yup, which again points to the fact that ray tracing was brought about several years too early. All this upscaling caper is just trading off image quality to get ray tracing effects to a decent level of performance. It really is ass backwards when you think about it, decreasing the overall image quality just so you can have some reflections etc rendered correctly, but at a lower quality than native res because the grunt just isn't there to do it at acceptable performance.