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Why bother with IPv6 support when IPv4 is more supported, and generally not in a state where we need to be using IPv6 as a default ?

For the same reason they made cars when horses were just fine.

There are already resources you can't get to with IPv4.

Also IPv6 is being mandated by the gov't (https://www.whitehouse.gov/wp-content/uploads/2020/11/M-21-0...). You might be able to ignore it and retire before it's the 'default', but deep knowledge of IPv6 is rising in demand.