Well, you'd be drifting topic again, as the issue isn't liking or disliking, but merely correlating something unique to 4e with the perception of that edition as NOT-D&D.
But, given that, you should expect one of 3 possible responses:
1) R did not exist in 4e (possibly because R doesn't exist at all).
2) R was also present in another, undisputedly-Really D&D, edition (or PF1, for that matter)
3) Oh, I hadn't thought of that, that's another possibility (though maybe a remote or trivial one) to consider along side the Primacy of Magic.