squeak: People turn mainstream accepted practice on its heels all the time when they think they can prove that the practice came from a mistake or an improper reading of the Gemara or something like that. I am not bold enough to posit this on my own (certainly not in absolute language, though I’m not sure that I’ve used absolute language about horseradish either), but there are certainly Ashlei Ravr’vi that agree that you might not be Yotzei with horseradish.
