This would be a pretty bad idea. Not only are companies going to steal all the data from that site, but its going to lead to people going through every user’s history to block people who don’t have the same “color politics” as them. Its going to lead to hyper echo chambers, even worse than other social platforms.
I think it would be better if this data is obfusicated even from instance admins. Does this present a bigger challenge in identifying malicious users? Probably, yes. However, it protects the Fediverse first and foremost from the vampire companies stealing consumer data, and protects the Fediverse from becoming the loudest echo chamber on the planet.
Differing opinions, viewpoints, and politics are important to genuine discussion. These “color politics” don’t have to even be part of the discussion to influence what people say. I don’t know about you, but being in a thread where people only ever agree with me and offer no alternative ideas is not a place I want to spend a lot of time in. Because who knows, maybe my ideas are wrong, and I might (shudder), change my mind.