No one has yet provided evidence that privileged ports create even a single security issue. While there's lots of huffing and puffing in the original article (including someone confusing privileged ports with IP based authentication, which is effectively dead), the closest it gets is to say that dropping privileges in a server is a pain. And then they go on to show off a one line configuration change that would disable privileged ports system wide. So do that if it makes sense for you.
What doesn't make sense would be to abandon decades of practice that real people (more than three in Finland, actually) rely upon because some people are too lazy to make a trivial change to their systems. And let's get real: 99.9% of people are never going to want to run a web server on their computers. You're just arguing that your portion of that 0.1% -- let's be a LITTLE sarcastic and call them five penguins in Antarctica! -- are more important than the rest.
The article doesn't just say that dropping privileges is a 'pain', but points out that a security model based on binding a port as root (or another specially privileged user) and then dropping privileges has been a persistent source of security issues. The article links to several detailed explanations of this (e.g. https://wibblement.blogspot.com/2021/11/the-persistent-idioc..., https://www.staldal.nu/tech/2007/10/31/why-can-only-root-lis...).
The one-line configuration change also doesn't work well if the service is executed via an interpreter or VM. Authbind also has its edge cases: https://www.reddit.com/r/golang/comments/cqlpnq/comment/ewyl...
>And for the three folks in Finland who administer multi-user Linux instances and rely on privileged ports for their mainframe-era security properties, they can always run sysctl and set their port limit to 1024 as it was before.
If you wanted to block non-root users binding certain ports, you'd still be able to do so. It just doesn't make sense to have this as the default anymore, as it tends to cause more security issues that it prevents.