I did not ask the script, but topic and tasks are provided together with some example questions and readings. I do not think so. The visual interaction is very important. Yes,I agree, visual image is important. Also hearing the native speaker often of similar age group is also important.
Teachers are normally much older than their students.
The video conferencing adds many things that are not always a given. The responses were sometimes so unexpected, you have to work hard. We have only one possibility. Our time 9.00 am and their time 5.00 or 6.00 pm and stick to this arrangement. I had an oler mature student who only use two fingers.