I don't see any problems with the current IPv6 apart from backward incompatibility with IPv4. If IPv6 is difficult to start with, I would recommend to look at M

I don't see any problems with the current IPv6 apart from backward incompatibility with IPv4. If IPv6 is difficult to start with, I would recommend to look at MAC address, Wi-Fi address, Bluetooth address first and then you will understand more about IPv6