Hard to have a conversation if you don't respond to the actual arguments that I'm making.
For the third time, the argument is not whether you are getting a better deal today with Schwab or with IB. It's about which market structure leads to lower costs. Do you understand the difference? Both IB and Schwab exist in a world where PFOF exists, so comparing them is irrelevant to what we are talking about. The SEC proposal is talking about creating a world where PFOF does not exist or does not apply to most retail orders.
The fact that PFOF is anti competitive is straightforward. They are literally buying exclusive market share from brokers in a business where it's all about scale. How do you compete with that? You can't because you can't even interact with the flow. To "compete" you would need to raise mega billions and try to achieve the scale without organic any growth.. it makes no sense and is clearly impossible.
Even Citadel themselves have literally said that it is anticompetitive:
https://www.sec.gov/rules/concept/s70704/citadel04132004.pdf . If you don't believe your PFOF buddies I don't know what to tell you.