"That's just nonsense in my humble opinion"

Seems more like an arrogant and/or ignorant opinion rather than humble...

The limit of pool reward and the rape of it, as well as construct of "proof of brain" is what Steemit is designed upon as the core principle, not nonsense.
If that is nonsense for you that why have you come to this platform. It doesn't make sense.
If you see it as nonsense (something that isn't important), then maybe you should leave as such attitude can potentially bring some harm to this platform as you appear as the person who doesn't care about this platform and/or it's community of long established, hard working content creators and developers.

"Give the so called "spammers" free reign for a test month and see if retention rates improve?"

Another ignorant comment. You are obviously clueless about the amount of plagiarism, spam, phishing and id theft that is going on. About 90-95% of posts created every hour on Steemi fall into this category.

Vast majority of Steemian (evidently including you) lives in oblivion in this matter.
If we stopped our work, the whole platform would be flooded in such crap.
Steemit already has opinion of scam haven where you can come and join and try to scam as much as you like. And that's because it is anonymous platform so there are no social consequences for such behaviour.
They just open new account when get caught and start abuse of platform again.