I recently took a course on Flutter from Udemy and was pretty disappointed. Not with the platform per se, but with the entire _idea_ of video courses on programmatic concepts. I only took it because for Flutter most of the resources are videos, and not books or articles.
I find that video courses do not invite the same level of interactivity I feel when I learn from, say, a textbook. There are also of course a horrible reference as one has to dig in to find a specific video, then find the time within that video to learn a concept, while with a book I can merely do a text search.
Videos also are frustrating in the fact that one cannot fluidly control the pace. One can pause and resume and increase from 1x to 2x and back again, sure, but with text I can merely... stop reading to code something up and then when I am ready to proceed I can... resume reading. I hate fiddling with a mouse or a keyboard to pause/resume/pause/resume/rewind, etc.
Needless to say I will not be taking a video course for anything programming related again.