Oliver, sleeves only retain heat, they do not give adequate support to the knee. I found the no wraps issue cool with guys squatting 160kg, but we have 5 guys that have gone over 200kg now, and with the influx of CAPO lifters joining, some have done 300kg without support.
Until you've had massive weights like this on your back, you wont understand the piece of mind a simple $25 knee wrap brings.
But thank you for your opinion Oli, and of course, you dont need to wear wraps or a belt if you dont wish to, it didnt harm Max at the Worlds not wearing a belt.