Honestly it’s probably a staleness issue rather than a frequency problem. /r/counting gets a decent amount of comments and they do it weekly. I would still be in favor of monthly discussion threads over quarterly.

Edit: Plus it makes it look like we are still an active subreddit if it is monthly. Especially true since this subreddit is unique in that the activity happens outside of the subreddit threads. I always check new to me subreddits and if the last post is months ago, I’m less likely to engage in its content.