I've been paying close attention to MEV/ordering issues, basically meaning someone can cut in front of you. The biggest impact isn't necessarily the "retail investors losing money" type of emotion, but rather slippage being eaten, transaction prices being shifted, the margins for market makers/arbitrageurs being completely distorted, and ultimately liquidity becoming thinner, making it harder for everyone to trade.

I thought only meme coins and on-chain IPOs would get sandwiched, but it turns out even orders that are slowly entering and exiting can be conveniently snatched... You might not feel it, but the flow of funds will tell you: the same addresses repeatedly pick up cheap assets along the same path.

Recently, the NFT royalty debate also seems similar: creators want predictable income, secondary markets want smoother liquidity. Unfair ordering is also the same contradiction—whoever takes the "certainty" ends up spreading the costs to everyone else. For now, just don't treat the blockchain like a queue for buying bubble tea.