Because you get to use cloudflares global content delivery network. For example if you are in the states but your server is in Europe, and your speed isn't great, cloudflare routes that traffic through their internal Network which is global and much faster. Cloudflares ip space is also generally universally accepted on networks that are more restrictive such as hotel WiFi that may block foreign IP space or blocks of IP addresses.What I did for this was set Plex network discovery addresses to https://IP:32400 https://IP: 443, https://cloudflare.dns.proxy.name:443 . This way it will try the native plex port first with no inline filters or proxy (as well as let's some unique Plex clients like "smarttv clients" that don't support the latest tls to work,) then the traefik proxy for access via restrictive Lans, and only fail to cloudflare in the event the IP isn't reachable from wherever I'm accessing Plex from. It rarely fails back to cloudflare, only a few times when on public WiFi with IP blocks in place, etc.If you add the 32400 discovery address I highly recommend you set the Plex encrypted connection setting from preferred to required.