Maybe a hybrid that changes with SP is an idea 💡
I think the minnows would almost all want the SBD to be as high as it can be since that means we can way more easily earn and powerup accordingly. ☺
I would not have been able to weekly increasy by +/- 10 % if this was not the case. It would therefore also lower my motivation for trying to spend my limited free time on Steemit to grow. The thing is true as you said about the stability argument. SBD is way more usable if it's indeed worth 1 USD. I think I want to see a hybrid between the two. maybe people below a certain SP should have more excess to option A and the higher your SP gets, the user would recieve a more balanced payout. (meaning more to the 1 SBD = 1 USD)
I can see this work, since being a big SP account, probably means you have a high Rep and follower count, so in term you could probably make a ton more than the minnows can. They have to struggle between increasing numbers of similar small size accounts.
Therefore in order to incubate the evolution of steem users, there is a greater pay out needed, this sets the good account apart from the lesser accounts, in a more quicker fashion when compared to a system where they would make all less. This is just a simple argument that so many evolutionists believe is true. Having a greater difference in the first moments, make A TON of difference. Having little differences (read lower payouts) would result in a system where good from bad accounts become indistinguishable.
I hope this did somehow contribute a thing or two ✌️
Thanks for wanting to both teach and involve us.
Greetings from Amsterdam,