Profile pictures on the desktop are a huge help! This is also why whenever I message someone about a BST thread I update the message’s title to the name of what I’m inquiring about instead of just leaving “RE: ” – makes it a whole lot easier to look through at a glance, especially with emails for PMs enabled. Unfortunately you can only edit the titles for message threads you start and not ones you are apart of so with big BST threads it can get a bit unwieldy.