I'm curious whether you could eliminate or at least mitigate this "dark forest" environment with privacy preserving transactions? There are privacy preserving

I'm curious whether you could eliminate or at least mitigate this "dark forest" environment with privacy preserving transactions? There are privacy preserving smart contract schemes (see https://eprint.iacr.org/2020/543 https://eprint.iacr.org/2020/543 for one example) however to my knowledge few if any have ever been implemented/utilised at scale. At least in theory this should eliminate or at least greatly mitigate the opportunity for MEV since the actions taken and the results are opaque. In reality however I'm not sure and I am absolutely not qualified to answer.