I've mentioned this previously. Without government-mandated standards, implementation could take years. We apply this approach to numerous areas; why should IP be an exception?
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And that is the point of this article, for most participants of the internet the benefits don’t presently justify the involved cost.
Peer to peer networking is important to rare users like me so I can do things like host a private Minecraft server from my house for my brothers and I to play on, but this is not yet a problem for me on IPv4.
Interestingly a few years back while I was moving and had no internet for a few weeks I temporarily moved the Minecraft server to my brother’s house and we discovered he was on CG NAT which was a total nonissue before then.
I sent an email to the ISP saying we wanted to expose a port and asked how to do so and they changed my brother’s account to be given a public IP no questions asked or extra costs. And I found this policy okay because probably 99.999% of internet users don’t do anything over the internet where a public IP would make any difference to their life.
I expect once enough of the internet is on IPv6 the cost benefit pendulum will swing the other way, but we're not there yet and it’s not clear when it might happpen.