The 30,000 rule limit is a pretty big deal breaker for me, but what sort of live heuristics are you referring to here? Aren't e.g. uBlock Origin's filters entirely rule based (not unlike most other ad blocker extensions)?
The quote from the article is here: https://bugs.chromium.org/p/chromium/issues/detail?id=896897...
"We are planning to raise these values but we won't have updated numbers until we can run performance tests to find a good upper bound that will work across all supported devices."
https://groups.google.com/a/chromium.org/forum/m/#!msg/chrom...