Last time I tried using the spoiler tag, I got multiple people responding telling me sync used syntax different from what Lemmy standard is. Not sure if that's been fixed yet, but sounds like an easy one.
Smqll thing but I'd love some metadata about the comment or post when I'm replying. Things like the time it was posted, username and maybe even subreddit with the instance. The full thread for nested comments would maybe be nice but maybe the ui for scrolling through that would be messy.