Is this an ad? Not only you mention a single engine, you also sell it as super easy.
The reality is that making good games is extremely hard, and has always been.
Unity is not the first game framework, there have been many along the years. Flash being one of them (while not even designed for that originally!).
Some of them are easier, some are more featureful, some have better graphics, some are specialized into a genre etc.
While some genres need almost no code, others are full of pages of tricky game logic. And that is without counting into account the engine code.
Further, Unity had nothing to do with Steam being flooded. The actual reason is that
1- Valve pivoted into being a distribution platform,
2- they stopped curating what goes in,
3- gaming exploded and became way more mainstream (along with streaming, e-sports and programming, all which helped a lot), and
4- people started making money selling courses, degrees and content on how to make games.
You broke the site guidelines here. Would you mind reviewing https://news.ycombinator.com/newsguidelines.html? Note that they ask people not to post insinuations about astroturfing or shilling.
I know that's not a perfect answer, but it's pretty much all we have, and the approach does have one major advantage: it doesn't need to care how veiled an ad is, or if it's an ad at all.
I'm not as optimistic about thinking skills, because manipulation techniques seem to work anyhow. But barring actual evidence of abuse, I think we mostly can only try to get better at countering false or distorted information with more correct information.
The reality is that making good games is extremely hard, and has always been.
Unity is not the first game framework, there have been many along the years. Flash being one of them (while not even designed for that originally!).
Some of them are easier, some are more featureful, some have better graphics, some are specialized into a genre etc.
While some genres need almost no code, others are full of pages of tricky game logic. And that is without counting into account the engine code.
Further, Unity had nothing to do with Steam being flooded. The actual reason is that