Ethereum

how about combining a dedicated L2 for privacy pools with a decentralized relayer network (to create one—time withdrawal wallets from privacy pool) and a cross-chain intent framework such as ERC-7683 with client-side zk proving in a dedicated wallet to allow shielding and transacting privately from any L2 and interacting smoothly with any defi primitive?

This would enable the following:

Any user from any L2 that supports ERC-7683 can shield their funds and make them private in seconds. Now, they can interact with any defi protocol on any chain straight from this privacy pool without any friction since unshielding and bridging is fully abstracted. 

A product like this could become the privacy layer for Ethereum. 

And there are already projects achieving <0.5 on consumer hardware for client-side proving

I am pretty sure this will be one of the breakout products/narratives later in 2025

Privacy, security, cryptography.
Here is my blog:
https://www.pawelpokrywka.com/

Exactly! Railgun is a great example. I think we are close in having all the pieces of the puzzle together to actual create a scalable privacy layer for the Ethereum ecosystem. 

volume and tvl in railgun on Ethereum proofs the demand. There is just no viable option on L2 with scalable UX (yet)

Research (and development) of this should be at the top of the list for funding/grant support from the EF cc/ @vitalik.eth

I would love it. I think the best practice for privacy now is using Railgun on L1. It's great, but cosly. The privacy sets on L2s are much worse. Dedicated, private L2 would be great if it had enough liquidity.