The point of deprecations is to eventually force a bad experience for those who are not keeping up. They definitely do work, but the time periods to affect change can be long. In the tech sphere many seem to interpret a long transition period as not working granted the usual pace of change.

Is IPv4 deprecated already?

That's different. There are ways in which ipv4 is subjectively better than ipv6, and "the catastrophe of needing more addresses" has not really panned out yet.

> There are ways in which ipv4 is subjectively better than ipv6

Apart from human readability, how so?

Some people like that addresses must be masqueraded behind NAT. We've solved how to do p2p through that system.

More "solved" than solved IMO. You still need some 3rd party to make the initial connection, for example.

The only way in which IPv4 is better than IPv6 is that many people understand one and not the other.

Three years ago Comcast told me they would be rolling out IPv6 to my business account... I'm still waiting.

is Frash depreciated? Tried browsing without ECDSA support lately? It can be done.

Resolver software is massively distributed, you don't force anything. The only place that can force anything from the top may be root servers, but even then, many resolver operators are probably just downloading root zone in bulk via https from somewhere to precache it and don't contact root servers at all.