Very difficult to assess value, hence, almost impossible to implement this. It's a painful, growing process that Steemit has to go through and it will end up with the filtering of meaningless, polluting comments. I guess reddit went through that too.
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For articles it's hard to evaluate value. But for comments isn't so hard. With the plugin I'll filter all the comments that have less than 10 words and contain one of the expressions: "great post", "valuable infos", "Awesome", "good post", "really interesting" etc I know this will not eradicate all the useless comments, but for sure it will remove at least 60-70% of them.