Looking at https://issuetracker.google.com/issues/117544989 https://issuetracker.google.com/issues/117544989 seems like Google mostly just ignored this feature

Looking at https://issuetracker.google.com/issues/117544989 https://issuetracker.google.com/issues/117544989 seems like Google mostly just ignored this feature request without giving any reason. I wonder the same. Perhaps someone who works at Google with access to the internal Buganizer will know more. But if you want me to speculate, my speculation is that the team behind Android networking is highly pro-IPv6. They don't really care about missing niche features in IPv4. Even for IPv6 they have a specific vision for how IPv6 should be used, resulting in deliberate non-support of features like stateful DHCPv6.