Lately, everyone has been arguing quite fiercely about "on-chain queue jumping." Honestly, MEV is basically just the right to reorder transactions being used for profit: someone sees the opportunity first, inserts their transaction into the block first, and makes a profit. This can lead to larger slippage, worse execution, or even situations where running the same swap twice is better than not running it at all.

I feel the biggest impact isn't from "experts," but from ordinary users who just click confirm with default settings and wait for the result, unknowingly paying the cost, thinking it's just their slow fingers.
Then, there's the issue of some mainstream chains planning upgrades or maintenance, and everyone in the group is speculating whether the ecosystem will migrate. Honestly, I don't know if it will or not, but as long as the transaction ordering remains so opaque, no matter which chain you switch to, there will always be people queuing and jumping the line.
Anyway, recently I prefer to do less trading to avoid shooting myself in the foot.
That's all for now.