The answer, I think, is what it almost always is: that inventors are simply extremely rare. People can have all the incentives, all the materials, all the mechanical skills, and even all the right general notions of how things work. As we’ve seen, even Savery himself was apparently inspired by the same ancient experiment as everyone else who worked... See more
The reason Revue scores so well is because it is the only one that combines the demand aggregation capabilities of a social network and the monetization strength of newsletters. Until a platform comes along that can do that, everything else is just a fun little bonus.