I worked on Web-Based Reputation Scores for IronPort/Cisco. I know how hard this is, especially at scale. This is not about them having a reputation as a concept.
My point is that Google suggesting you register a different domain because their href-based reputation sucks over time is a cop-out. This specifically falls under the "Things that are Google's fault".
Matt's suggestion here is definitely practical, but it's a fault in how Google looks at domain reputation. When he talks about "having to renovate a domain" he's talking about you the consumer of a domain legally acquired and without spammy content hosted on it, having to play Google's algorithm, because their definition of "spam" is absolutely massive, vaguely defined, and with way too long of a ttl.
And with a massive, undefined, long term concept of spam, you're going to have ridiculous FPs. Which Google has, and is now recommending is somehow your responsibility.
This is entirely their fault, and it has to do with how they are determining reputation, not that they have reputation at all.