For me the ability to seamlessly start a meeting, pull in 10 participants from different organizations by just sharing a URL and be off to the races a few minutes later is what makes the difference. If I have to spend even a couple of minutes debugging audio/video issues, dealing with people that can't seem to join, people that are trying to install a client that they then can't get to work, people that need to make IDs for some proprietary system and so on then it's a non-starter for me.

I'm fine with asking the meeting organizer to have an account but the participants should just be able to use the web client with a minimum of hassle.