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> but to my knowledge the vast majority of us do not have any choice in who fills an order

Why on earth do you care who fills your order?

If you place a GTC/Day limit order, it will fill at the price you deem fair, or better.

If you enter a transaction to deal a quantity of a security at the price you deem fair, what difference does the nature of the counterparty make?

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The “or better” is doing a lot of the heavy lifting here. Your choice of counter party has a large impact on the price improvement.

> The “or better” is doing a lot of the heavy lifting here.

I disagree, I think I could have skipped the "or better" without making a substantive change to my point.

Is your argument that the presence of HFT participants (or really electronic market makers) leads to reduced price improvement for other participants?

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