Skype was P2P for voice, video and files- only text chat and user discovery had any major server usage so users could receive chats while offline. Microsoft still sought to centralize & monetize it, they actively removed a lot of the P2P networking to "improve user experience". Any service owned by any profit seeking corporation will have the same end result regardless of the underlying tech; their excuses will just change forms.
Yes, and that will always be the case. But I feel like P2P software tends to get shittier slower. There are probably some open-source solutions out there right now, waiting to be adopted.
Quick search turned this up, but I’m on mobile, so not in a great place to dig into how viable it is. A Reddit post indicated it’s in some sort of alpha/beta stage, but I think it is something you can use today