You're using the exact same definition. "It just works" for you, so you're saying it just works, and you're discounting that it doesn't just work for me and many others who don't want to install software just for fricking videoconferencing, when plenty of other apps do it well in-browser without constantly nagging you to install something thereby making you feel like a second-class user.

Of course "it just works" is a subjective, personal opinion.