"Too powerful" doesn't seem like a thing until you realize it undermines DBA's skill investments, means business level people have to learn something and solve their own problems instead of managing them, disrupts the analyst level conversations that exist in powerBI and excel, seems like an extravagent performance hit with an unclear value prop to devops people, and gives unmanageable godlike powers to the person who operates it. (this unmanagability aspect might be what holds graph products back too)
If you don't believe me, the list of companies who use them also get a rep for having uncanny powers because of their graphs, FB, twitter, palantir, uber, etc.
Using ML to parse and normalize data to fit categories in RDF graphs is singularity-level tech, imo and where that exists today, I'd bet it's mostly secret.
