Ask HN: Thoughts on Email Courses?

I found a pretty good free Computer Vision (in python) email course by pyimagesearch.com (https://www.pyimagesearch.com/free-opencv-computer-vision-de...) It's just a compilation of tutorial articles from the blog (which is why it's free), but in a curated order to make some more sense.

I've created a few courses for career development/job seekers and the pushback I get from younger generations is they want video in 5 minute snippets. I was under the impression "one-lesson-a-day" of meaty content; roughly 30 minutes of reading for 1-2 weeks depending on the course, was the better value but...

I agree. It can’t be interactive but I guess it can be made interactive with a link to quizzes/tests etc.

Courses can also include a live chat session for interactive live with instructors and other students