I was referring to their non-thread-safe (within a single ENet instance) architecture combined with the need to block if you want to pick up a packet the moment

I was referring to their non-thread-safe (within a single ENet instance) architecture combined with the need to block if you want to pick up a packet the moment it arrives. I have to block to receive that packet, but while I'm blocking, I can't send a packet (because ENet isn't thread safe). Now, it will let you set a receive timeout, but then you just spend a lot of time spinning.