PNMH: why do network designers always postpone their IPv6
implementation even past legally required deadlines?

ChatGPT: There are a few reasons why network designers may postpone
their IPv6 implementation, even past legally required deadlines:

Compatibility issues: IPv4 and IPv6 are not directly compatible with
each other, which means that devices using IPv4 cannot communicate
directly with devices using IPv6. This creates interoperability issues
that can make it difficult for organizations to transition to IPv6
without causing disruptions to their existing networks.

Cost: Implementing IPv6 requires an investment in new hardware,
software, and training. For some organizations, the cost of upgrading
their infrastructure to support IPv6 may be prohibitive, especially if
they have already invested heavily in their existing IPv4
infrastructure.

Lack of perceived need: Some organizations may not see the urgency in
transitioning to IPv6, especially if they are not experiencing any
immediate problems with their IPv4 networks. This can lead to a "wait
and see" approach, where organizations postpone their IPv6
implementation until they are forced to do so by external factors.

Complexity: IPv6 is more complex than IPv4, which can make it more
difficult for network designers to implement and manage. This
complexity can also make it more challenging to troubleshoot network
issues that may arise after the transition to IPv6.

Lack of IPv6 support from vendors: Some network hardware and software
vendors may not yet fully support IPv6, which can make it difficult
for organizations to transition to IPv6 without making significant
changes to their existing infrastructure.

Overall, transitioning to IPv6 requires a significant investment of
time and resources, and network designers may delay implementation for
various reasons. However, as the pool of available IPv4 addresses
continues to dwindle, and as more organizations begin to adopt IPv6,
it is becoming increasingly important for organizations to make the
transition to IPv6 in a timely manner.