Not the OP, but you should also be reminded that many of these limitations are brought out by cost-cutting measures that we didn't have control of and could be used to fire us immediately, and even when IPv6 is implemented most IoT backend servers only operate over IPv4 anyway. Another one that you might be angry about is only including 2.4GHz-band WiFi even though 5GHz WiFi is already ubiquitous (although only including 5GHz WiFi is much more questionable ;).

Exactly this, we’re a small team and have to pick our battles. In practice very few people have IPv6 only connections, and even fewer of the people who buy our products.