I disagree with you. The majority of users don't care about being behind a CG-NAT (what you call "crippling"), and CG-NAT offers a very big layer of protection that avoids problems like the one on this article.
Users don't explicitely care because they don't know. It doesn't make much difference when viewing YouTube videos, but there's more to the Internet than cat videos.
CG-NAT is crippling because I want to receive incoming connections like anyone else who has a connection to the Internet should be able to. Router manufacturers can do better. The world does not have to consist solely of cloud-based middle-men who take full advantage of the fact that all your data has to pass through them, and that you have to trust them.
https://www.voip-info.org/stun
Both Linksys and CG-NAT need to be avoided.
Also it is very likely you are still vulnerable from other users on the same ISP attacking you.
Also, QUIT BREAKING THE INTERNET. CGNAT is complete crap that breaks the internet peer model. Even ISPs not using CGNAT are pushing complete crap on users. For example last week I had a user that VOIP stopped working. They received a new integrated cable modem router from their ISP. If you rebooted the unit VOIP worked about an hour, after that it would stop passing VOIP packets (ran tcpdump on the server and watched them stop). If we ran VOIP over another port it would work (but had different issues related to changing around 50 phones so we only used it for testing). There were no options to disable SIP_NAT, nor any other settings that would fix the problem. Since this ISP also provided their own phone service I found the whole debacle rather anti-competitive. They simply have no interest in contacting the modem vendor and having them fix the problem.
We ended up supplying our own modem and router in this case and the problem was resolved.