It's a delicate topic, that's for sure. It also depends on people's preference.
I'm just letting you know one's perspective.

Yes, teacher is instrumental - in the end he/she's the one who prepared/created such material in the first place, of course that person is important.

You can perhaps test it first-hand - next time when you're teaching a class something, try to be a bit more detailed than usual (e.g. anticipate some questions and answer them upfront, and also if there's some prerequisite knowledge that you could go over in like a few minutes, do it - even if entire classroom is nodding their heads "we know that already", I can promise you someone's sitting over there that's too shy to ask for help because everyone else seems to know it already #peerpressureisreal). Then see during that lecture how many people were confused and had questions. The less people that had questions/needed additional help - the more likely what you just did would of have made a perfect video.

Anyway your idea behind remote teaching is already pretty huge improvement I'd say, so thumbs up for that!