IPv4 is not just about larger address space. It has better autoconfiguration, better multicast, better MTU, and it has a constant size header to make routing ea

IPv4 is not just about larger address space. It has better autoconfiguration, better multicast, better MTU, and it has a constant size header to make routing easier. Unlike IPv4, it works well with no centralized server assigning IP addresses - between link-local addresses and multicast, you get everything you need to communicate locally, automatically. It is a good protocol and we should use it because it is good, not just because address space exhaustion forces us to.