A slightly better metric to train it on would be chances of survival/years of life saved thanks to the transplant. However those also suffer from human bias due to the past decisions that influenced who got a transpant and thus what data we were able to gather.

And then Discord arrived

The comparison with Discord makes non sense, the feature seems to be just a normal group chat, like the ones in Telegram/Whatsapp/iMessage. Discord’s killer feature is the ability to have multiple channels within a server, which allows more organization.