it's probably subjective, but I find these collaboration features can be overused for this kind of thing.

If someone is walking me through something, I just want to see what they see so I can focus entirely on what they're saying and no part of me is distracted by having to follow along or seeing other code.

I know typically these collab modes have an auto follow feature, but it's not as simple as just read only video being streamed to you, there's loads more ways it can go wrong and add noise / distraction that provides no benefit.