Part of the ease, I suppose, is that sign language isn’t like “regular” language – you don’t make sentences proper, you just sign the most “important” parts: subject, objects, main verb, etc. You don’t need to worry about all those other bothersome parts of language that make you sound like a retarded 3 year old monkey when you speak (what natives refer to as “particles”, “adverbs”, “tenses”, etc.), and given that my spoken Japanese basically goes something along the lines of “Me. Hungry. Eat.” or “Toilet. Hole. Ground. I. Poop. No.“, I find I’m already well on my way to the minimalist approach eschewed by sign language practioners.