Not all good horsemen of history had named mounts nor special types, they were just skilled as riders. Unlike for example Lu Bu, whose horse was described to be the horse of horses pretty much. Meaning the horse itself was special, but alot of characters from history, legends, myth etc doesn't have named mounts but are still capable of doing great feats of it due to the riders particular skill with the particular type of mount. Sure it won't be as effective as someone having a special and named one I'm sure. As for your question. I don't know if you need a noble phantasm as I am not that into fate. But limiting it to people only using named/special mounts is kind of silly as it is the rider's skill which ultimately matters and not the mount. Sure it plays a difference but should it be the only factor? [@King Cosmos]