Hearthstone lets players communicate with exactly six innocuous phrases including “Greetings” and “Well played!”. I gather Blizzard learned from their RTS games that free-text communication in 1v1 games is unnecessary and toxic.
Yet, people still sometimes manage to come across as assholes when they use one of the Hearthstone emotes (for example, by spamming one of them repeatedly after making a winning move). At one point they decided to remove “I’m Sorry” and replace it with “Amazing!” because the former proved to never be used earnestly and to have bad vibes.