Well everyone needs some downtime, and then I think it's important to acknowledge that there is a range of quality within the category of "educational entertainment." You can learn a lot of interesting things from 3BlueOneBrown and Veritasium, even though neither compares to working through a textbook.
I agree, and I dont know much about the channels you mention but im referring more to the short videos with fast cuts that are just designed to keep you watching instead of teaching you anything. Its like the overly processed vegetables you see in many stores ‐ it seems healthy because its real veggies but its actually junk food even if it is better than sugary junk food.