It has never made sense to me that we want an infinite log of chats. The content is unorganized, and low quality. If something is so important you should put it in an email, wiki, PDF, etc, where the information is a lot more dense and easy to sort through. I look at stuff like imageboards, which aggressively delete old content, and can't help but feel that stuff like discord is over-engineered. If content older than 30 days was pruned or only the last 1000 were kept I think 99% of users would not care.

It also majorly creeps me out that everything I've said in what's supposed to be a casual conversation is searchable forever. Not that deleting old messages would necessarily change anything, but I don't see keeping them as a good feature.