In some circles yes, but discord is more replacing teamspeak/skype than steam directly. They are clearly pushing in valves direction, however (Discord has games too etc.).
Also, Discord looks pretty is depressingly badly constructed software.
Agree, but a lot of games use the Steam service for adding and playing together with friends in ingame lobbies. Battlenet also has it's own social service that all games on it use, same with Epic.
