Recently, I've seen more people complaining about validator income, MEV, and transaction ordering fairness. Frankly, from the end-user perspective, no matter how advanced modular blockchains are, what matters most when you open your wallet is: can I avoid being front-run, have consistent transaction fees instead of fluctuating wildly, and prevent transactions from getting stuck and failing.

The two main changes I feel from modularity are: first, the chain no longer has to bear everything itself, so the sudden congestion and choking during peak times happen less frequently; second, the same operation might run on different layers, making the experience more like "changing the kitchen behind the scenes," but the bread that comes out still needs to be stable.
As for fairness... it seems it still depends on rules and transparency gradually being refined. For now, I just keep my positions more conservative so that a single transaction order won't swing my emotions too much.