Tbf the title like Kaleid Ilya and Strange Fake, even FGO are just a mere spinoff which fanbase considered it as canon but in my opinion you dont really need to watch/read it unless you want to. Basically they are just a milking from the original source (Fate stay night) so as long they can used as cashcow they will probably made another series of Fate until nobody know when. So yeah if you want to understand the true lore, visual novel is the best way