Could you explain more details of the reason you want this to be true by default? These settings are mainly for developers who want to dig very deep in the RT mode (Ray Generation or Inline RT), most of them are not used by normal dev and modders.

The option to enable/disable raytracing default to on in the current runtime - I think it gives more of an opportunity to see the comparisons and for creators to easily showcase the differences from the original game style and the remixed game style. Similar to how the Halo Anniversary had the option to easily switch back to the classic style, or the remastered style.