Great to meet you!! I share similar reasons! I love learning about languages, and I'm finding it really interesting learning a visual one as it's so different but I've also found some very interesting similarities with certain aspects!
I don't have social anxiety, but I do get burned out from conversations and the idea of verbal communication can just feel too much after a while, so being able to sign is a massive benefit- but only if other ppl also know it lol😅