Good observation, and reasonable question. The A330s I flew had no brake cooling fans and on short turn arounds, or taxi routes that required multiple brake applications, brake temperatures could become a concern. It was standard practice to keep the gear down for a while to cool the brakes. We only did this when factors such as fuel, wx, ATC and terrain/climb gradients weren't a factor. In the event of anything out of the ordinary occurring you could always raise the gear and sort the problem out, realising that you might later on get a warning of hot brake temperatures later. It was always pre briefed as it is a potential threat and a deviation from standard practices. I hope this answers your question.