In addition to other comments, Steam Chat had significant in-roads with the gaming audience that would eventually form the foundation of Discord. It is quite plausible, had Steam improved chat earlier, that Discord might have never gotten the traction it got.

Nowadays, I find Steam Chat is a ghost town.

Valve only recently implemented a semi Discord-clone(with way better quality voice chat, give it a try some time if you haven't yet).

Their chat system has been famously bad and mostly unchanged since the early 2010's, and only very recently was reworked into this.

>(with way better quality voice chat, give it a try some time if you haven't yet).

Well, I'm using VoIPs basically for >decade everyday and voice quality was never something I cared about (I mean that all soft that I've used was somewhat decent in that matter)

the most important thing is - how to get all people on the same program? and I'm finding it not so realistic to get all friends to Steam

I think the parent was implying that steam groups could have improved to the point where Discord would not be necessary.

Steam is not a standalone chat product. I mostly use discord for non gaming chats.