Thanks for the feedback, and thanks for trying out the site!

We've found, both in talking to language teachers and in our own experience, that video helps communication and comprehension. However, it's definitely the case that for both privacy and bandwidth reasons, sometimes it's a liability. We don't require a webcam so for now you can just disconnect it if you're uncomfortable with it, but we're planning to add an option to intentionally omit the webcam feed in the future.

Thanks for the idea on topics; we've got a lot of ideas in that space, but we wanted to launch as soon as we had a viable product.

Glad you liked the call quality, it's central to many of the features we're hoping to introduce in the future. There's lots more coming. This is just the first step. :)