You'll also filter out people smart enough to know that this is a bullshit keyword matching game and the only way to win it is to put the keywords on their resume.

Because they assume that the job posting was written by a non-technical idiot, and 95% of the time, they'd be correct, and they are just playing the game as the game expects to be played.

Look. If you're looking for 100% integrity and honesty from everyone in their communication, you shouldn't expect find it in a corporation's hiring and HR process. Everyone white-lies (or black-lies) all the time, both up and down the chain. The bones of this interaction do not value, reward, or even want honesty.

Everyone hates on HR here, but I did found them quite good in companies I worked for. They were not the ones who judged technical skills or even picked people. They scheduled interviews and such.

The worst hiring nonsense I have seen came from engineers. Stuff like giving people weird puzzles, rejecting or accepting people on random factoids, "beer test", demanding uber senior experience for an unglamorous boring take jira close jira position. And above all, believing that every good engineer is my copy. It takes an engineer to reject a guy because he reads different blog, has different opinion on programming languages company does not uses anyway.

I heard a hiring manager, an engineer, say that he knows whether he wants the guy or not in first 10 second. It is clear in that first sentence from vibes. I genuinely it is people like him who make hiring process into crap.