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In practice the Internet does not deliver IP packets. Only UDP or TCP is universally supported. Some firewalls, security appliances, filters, and proxies limit end to end connectivity to just TCP 443. Everything over IP has turned into everything over HTTP.

Not a hot take at all. We don't need 100% IPv6 adoption because we can't control what people do in their private networks. If a load balancer supports IPv6 that's good enough, even if the load balancer talks to the backend over IPv4.

Which has been a more significant driver of address-space exhaustion: web servers, or consumer/corporate client devices?