Many similar concerns were raised when the Safari API changed, in this case some of the specific limitations and concerns re the declarativeNetRequest approach may be valid – if so, I'd hope that the Chromium team take them on board and improve.

I think the concern re the 30,000 rule limit is misguided. Many of these adblock rule lists are extremely inefficient and should probably be pruned to have less rules.

Extremely good and effective adblocking across most websites can be achieved with significantly less rules.