All people on this site brag of p2p and their technical prowness, yet no one has managed to build a killer p2p chat app. Disgusting!
Probably, they are still debating what programing language to use.
It's decent platform for simple sentences and trading emojis/memes I guess.
There are significant computer science challenges when building peer-to-peer software that are much easier to solve when building a centralized system. This may be the reason that people seem to "brag" when they create something p2p - because it is difficult to do - and it may also be the reason why there has not been in your opinion "a killer p2p chat app" yet.
One great thing about WebTorrent is that it makes building p2p software for the web much easier. They have done a great job!
Even the non-p2p open source apps are less polished.
So really it has nothing to do with p2p at all.