Can you point to such a person?
Marx is a fairly uncontroversial economic thinker, most of his theories stand up, he’s of the same ilk as Smith or Keynes but we don’t go around talking about Smithists and very rarely about Keynesians. We accept any economist worth their salt knows of all these theories and their place.
The point is he made an analysis of the economy, including thoughts on how the means of production may come into workers hands in various circumstances but the idea there’s some fully formed political program isn’t accurate. Many people claim to be Marxists and doing things in his name, many many more call everything they don’t like Marxism, thanks to both sides it’s basically a meaningless term these days. There’s no one school of Marxist thought. There are lots of people inspired by his analysis.