Hello from Kiln,
We’ve been similarly testing on Holesky at scale on about 50 000 validators (non-lido keys) without noticeable issues so far (PBS), we are confident we can gradually ramp it up in mainnet once we have a go (we’ll likely do it on our non-Lido keys anyways).
As highlighted by Chorus One, we are also really happy with the transparent process and discussions around it, and thankful to the team working behind it.
We think the project is important as pre-confirmations will come up with multiple sidecars and flavors, having them designed in a similar fashion so that they can be operated/ in the same way/packaged as one unit will benefit everyone on the staking landscape.