I think as @wholeself-in that he should have anticipated that question and should have had a ready-made answer
Something like this for instance: "There's bound to be some dross especially with a young platform that is exploring a discovering a whole new model of creating content and rewarding the creative process. It is an evolutionary process"
Or he could have stressed the positive aspect, with the great quality original content that is also present and given for instance the example I gave in an old post of mine where I saw one of my guys (rather steemit-averse) learning about Qtum by studying a detailed post published ... on Steemit, of all places !