Because you wouldn't need dozens of them competing for mindspace and user share unless they each claimed to be better than their competitors.

And because Ethereum isn't money like Bitcoin, so the bar is lower. That is, they can afford to compromise on the trilemma. They can have some centralization without fear of censorship, because they already succumb to censorship. Bitcoin is already up in arms about having federated L2s.

See all of them here. There are a couple that are rated to have no compromises, but I don't know anything about them.