Point 1. How the heck would you eat horseradish. I hate romain lettuce.
Point 2. Even if this is only a chumra, its certainly more understandable than several minhagim that came from Europe that bi’shaytum were nogei’ah and now have no pracrical application and are still practiced out of ignorance. They are minhagei shtus. This chumra is a psak from a big rav.