It's not about doing trades without moving market afterwards, it's about market moving _before trade_ as a preliminary response of the trade existence.

But trades aren't atomic, even though the i-bank traders in Flash Boys wanted to get paid to pretend they were. If you're trying to unload N shares, that's going to happen in some number of k<=n-sized chunks.

I'm not sure how this can be applied to the discussed issue? Especially considering that this kind of trades are atomic (when run by miners/flashbots), though maybe we use different notion of "atomic".

I don’t think that’s crazy. I think most people think it’s fair that the plumbing between their decision and the action shouldn’t be used to profit from them. Of course it happens in tons of ways. But that’s the general feeling. They want to see an order book, and if the book quotes X price, the seller won’t change it when they click the Buy button, etc.