AMD cards seem like they'll be fine with 'light touch' RT, it's when it's used more heavily that it will run into problems (and you can be sure Nvidia will do this on their sponsored games even to the detriment of their own cards performance, they have form for it!)
have yet to see this happen, I haven't seen any games that force on heavy RT effects just to tank amd performance. All RT games I've payed have very dynamic graphics settings that scales for different gpus