If my bouncer goes down, I don't have the history for the period for which it was down. Congrats on 100% uptime, but that's not the numbers one should plan by.
If the bouncer goes down and your team uses only the bouncer, someone fixes the problem before new history is made, and nothing is lost. Fixing the problem means rebooting the machine, there is absolutely nothing that can go wrong with a simple IRC bouncer.