It works and does what is advertised. That is its strength and weakness. By that I mean, what I choose to do (audio only or audio+video) is applied universally across YouTube.

However, given that YouTube is a varied platform in terms of content, it would have been great if there was an option to apply this setting on a channel-wise basis.

I am subscribed to certain science shows that require audio+video, and certain podcasts where I don't really need video and audio-only would do. Hence, it would have been great if I could configure these podcasts as audio-only and the science shows as Audio+Video.

Given that this extension hasn't been updated in 2 years, I have little hope that this will happen. But still, putting it out there.