> Why don't you want every device to have a public IP?

Big companies would abuse that beyond belief. Back around the late 90s ISPs wanted to have everyone pay per device on their local networks. NAT was part of what saved us from that.

IMO, IPv6 should have given more consideration to the notation. Sure, hex is "better in every way" except when people need to use it. If we could just send the IPv6 designers back in time, they could have made everyone use integer addresses.

    # IPv4 - you can ping this
    ping 16843009
    # IPv6 - if they hadn't broke it :-(
    ping 50129923160737025685877875977879068433
    # IPv7 - what could have been :-(
    ping 19310386531895462985913581418294584302690104794478241438464910045744047689

It's simple, unambiguous, and scales infinitely.