In my view, the problem largely comes from the way the Internet has grown. Many of these concepts developed together with the Internet, and IPv4 was the protocol that evolved with them.

I see many ISPs deploying IPv6 but still following the same design principles they used for IPv4. In reality, IPv6 should be treated as a new protocol with different capabilities and assumptions.

For example, dynamic IP addresses are common with IPv4, but with IPv6 every user should ideally receive a stable /64 prefix, with the ability to request additional prefixes through prefix delegation (PD) if needed.

Another example is bring-your-own IP space. This is practically impossible for normal users with IPv4, but IPv6 makes it much more feasible. However, almost no ISPs offer this. It would be great if ISPs allowed technically inclined users to announce their own address space and move it with them when switching providers.