Recently, I've seen a bunch of people complaining about "on-chain queue jumping," basically meaning you just confirmed your transaction, and then someone else snatches it first, even raising the price a bit, making you feel like a sucker.

Who does this affect? Small retail investors the most, probably. They already complain about high fees, and now MEV is taking a cut of their profits; big players can find their own ways (private transactions, connections), and it’s less bothersome for them.
The sequencers/validators are also in a tricky spot: the higher the proportion of MEV in their income, the more it looks like they’re just profiting from "queue-jumping fees," and their fairness gets called into question.
You say banning it completely isn’t realistic; in the end, it still depends on who can make "first come, first served" more human-like—like transparent ordering, auctions, or at least not making ordinary users pay liquidity subsidies every time...
I don’t claim to be an expert, but I just feel that the current experience isn’t very user-friendly.
I’ve got work to do.