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As a developer, having to support IPv4 and IPv6 is a pain in the butt. It's an even bigger pain from a network security perspective. Vendors are still way behind the curve on IPv6 implementations. It's a risky proposition to use it, then find that somewhere along the path from source to target there is an incompatibility. IPv4 is mature and works well. A good firewall with NAT on the LAN side can handle a lot of hosts with just one unique IPv4 facing the network.

My Linux and Windows boxes have dual stacks. Ditto for the house router. I don't expect to push IPv6 traffic out the WAN interface as I have no certainly the ISP or network beyond will work. The managed switches date back to IPv4 only. They support VLAN just fine. There is not a lot of incentive to upgrade to a managed switch that handled IPv6.

A good firewall with NAT on the LAN side can handle a lot of hosts with just one unique IPv4 facing the network.

This is why I don't understand the shortage of IP4 addresses.