Saw this at a hybrid company. Chat wasn't required over Slack. Though if it was a work topic requiring a remote coworker (like myself) then sometimes they'd use a conference room and call to bring in remote folks, or everyone would go back to desks for the call.

Occasional all hands conferences provided some IRL a few times a year. IME these weren't strictly necessary yet did provide a chance to bond with the people on the other side of the glass.

Career wise I do think that fully remote can be a boon to shorter and less attractive coworkers, since it reduces or eliminates some of the tall+beautiful biases.