Hi @forbzie22_0253,
Unfortunately, this is still required. By default on Windows, HTTP.sys reserves all ports below port 1024. The netsh http add urlacl url=https://*:443/ user="NETWORK SERVICE" tells HTTP.sys that NETWORK SERVICE can register port 443 and listen to all traffic on it bypassing HTTP.sys.
If you specified a domain, https://my-domain.com:443 instead of https:://*:443, then HTTP.sys will handle all traffic but will allow NETWORK SERVICE to subscribe at that domain. HTTP.sys will still handle all traffic though. That will then cause the integrated web server (IWS) to use HTTP.sys instead of Kestrel, which is why we recommend the port binding method. This is all outside of IIS. That reason is also we added documentation on how to Use IIS as a reverse proxy.
Hope this helps!
Thanks,
Rich