Ethereum actually has almost no client diversity. The vast majority of nodes run the geth client (go).
Regarding the security aspects of L2s: they will of course not be anywhere near as robust as ethereum itself, but over time they’ll get better. However, they also don’t need to be as robust as ethereum given they effectively benchmark against the ethereum chain so while things could go wrong, the amount of damage will be very contained and as the ethereum mainchain scales the damage radius becomes ever more contained. Finally the bridges that are being implemented to move assets from ethereum to the L2s can implement emergency withdrawal mechanisms which allow users to get their assets out even if things go wrong.
Not perfect, but the tradeoff seems reasonable to me given the performance enhancement and the diversity of functionality that can be offered via many different environments.
Disclaimer: I’m quite possibly biased due to my company working on L2s.
You can solve for this with a commit and reveal scheme, where trades with hidden price and size are committed in the first period and revealed and settled in the second period.
The advantage of speed or waiting until the end is mitigated as you can receive no additional information either way.
Regarding the security aspects of L2s: they will of course not be anywhere near as robust as ethereum itself, but over time they’ll get better. However, they also don’t need to be as robust as ethereum given they effectively benchmark against the ethereum chain so while things could go wrong, the amount of damage will be very contained and as the ethereum mainchain scales the damage radius becomes ever more contained. Finally the bridges that are being implemented to move assets from ethereum to the L2s can implement emergency withdrawal mechanisms which allow users to get their assets out even if things go wrong.
Not perfect, but the tradeoff seems reasonable to me given the performance enhancement and the diversity of functionality that can be offered via many different environments.
Disclaimer: I’m quite possibly biased due to my company working on L2s.