Hi

Difficult to answer as it depends on age. I think the advantage of in person is the break time. People do mingle, exchange for numbers.

But the same happened online.in every single seminar people contacted me and sent me their phone number. For example i just started the masters. The first week they dont start seminars/classes.they use the first week for intensive seminars.so i did a one week seminar in neuroscience, 9-6 m-sat. The professor emailed us before and grouped us.the girl reached out to me and we chated the whole week before.so professors try to do that.

I am also an introvert.i do know someone with social anxiety. Lots of professors are on the side of "you dont have to talk, you dont have to ask questions". In the big group they dont make people talk.then they organise people in subchats and there peolle talk between each other.
Yesterday i had the bachelor arbeit meeting. Its suppose to be written in english. Poor professor was keep switching between english and german.
Some professors are not that nice.i noticed the ones scared of covid are a bit more stressed. They want people back in classes but only vaccinated ones.so thrre is so conflict going on now.
Not sure if i answered your question. I think rearly you are made to speak but it can happen.

I think in the end its all about which professor you chose even for the same seminar....