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I get your point, but I find the above challenges to be plenty challenging as is. I agree with the 10 films Directed by women Would be challenging as well. As well as interesting and intriguing.
As for watching mediocre films by actors , quite often I’m not sure if a film is mediocre Until after I’ve watched, and even then I never considered it a waste of time. I mean, I watched all of the Friday the 13th films over a span of one week many years ago. They were terrible. I wouldn’t call it a waste of time.
I like decades over years because it offers more variance, but I can see how a “10 best of the year” could be interesting.
So I agree with some of your points, So maybe Jabs can incorporate some of your optional challenges.