In effect, it does no such thing. It does the exact opposite. It strives to return an equilibrium among all stakeholders.
It does.
It pretends to use signalling from nodes to create your pretended equilibrium but this is easily skewed by a sybil attack.
Miners are then left to pick a number while unable to discern between legitimate nodes and the sybil attacker.
Yeah, thats a really valid vector:
miner a: Hey, looks like we got 8000 extra nodes on line!
miner b: Wow That looks legit. How long have they been online?
miner a: About 8 minutes. And they are all voting for 16 Exabyte blocks.
miner b: And whats the average for the last 1000 blocks?
miner a: 1.42Mb
miner b: Yup, sounds like 16 Exabytes it is then....
Your suggestion indicates a more trivial understanding than you are letting on.