I think that while having usernames bolded in the chat box helps differentiate messages, it could be better in my opinion! If there was a small space between messages, it would be a lot easier to read and look at. It might just be me, but I feel like I’m squinting a lot while trying to read the chat because messages are so close to each other and look like it’s all one huge block of text.
I also like this idea! It could go in the chatroom preferences with the purge rate, night box, etc. That way users can choose how much distance they want between messages, much like line spacing in a word document.