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there's truth to this, although even on complext subjects, you get armchair experts who dont have a clue.
worst is when there is a building video or somebody doing plumbing, you;d think there was an elite plumber squad in the comments all sounding off!
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Maybe it's (distantly) related to the law of triviality: the simpler something is, the more people add their opinion, simply because they can, additionally to simple questions attracting not the brightest people (my hypothesis)