By the way, I want to add that “The Trade-off Way” to tackle the distraction problem may be suitable to those people with low self-discipline, such as me. There is no good reason to make any trade-off for highly self-disciplined individuals, because they do not get addicted or distracted into anything.
Moreover, I want to use the Gallery update as an example to further illustrate “The Trade-off Way”, in which I can ask myself similar questions:
1) What is the most important to me? Getting feedback from Gallery or 100% concentration on course videos?
2) If 100% concentration is much more important to me than the feedback from Gallery, then would I like to make a trade-off by sacrificing the feedback from Gallery (i.e. not posting anything in Gallery)?
So, under these questions, two groups of people have different answers:
(A) For low self-discipline, such as me, my brain can only do one thing at a time, so I completely give up the feedback from Gallery, but stick to the most important thing – 100% concentration.
(B) For highly self-disciplined individuals, their brain can be good at multi-tasking, so no trade-off is needed and they get feedback from Gallery and 100% concentration at the same time.
Thank you again, @wardred !