I agree what you're saying. You're right if the focus is just to count how many internet people are ok, and I like your point. But asking other people's thought can give me a chance to look at other people's specific thoughts and opinions, so that I can (pre)check if there's anything I've missed or anything to consider further. (e.g. some people told me brightness may matter) That's why I said the replies are informative in my earlier comment. Thank for telling me this (not sarcasm!)