The only time the proposal is uniquely effective is when the rate is dropping down to near zero

That is the circuit breaker you have.

I am proposing a circuit breaker that kicks in before zero and is programatically predictable.

You propose people to buy HIVE and unite to defund proposals, that creates social chaos because it generates disagreements. Having a programatic features to defund makes it predictable and no one has to argue and fight against projects they use and love but know they can't afford.

I wrote a lot here and deleted. I am tired, boss.

Your point on hbd_print_rate is technically true. Not worth going over again why economically it is nonse due to the DHF, which BTW has value, it is just unnafordable in current market conditions in any token it could pay.