Performativity ruins the value of aggregate signals.
If it's authentic, if it's just for you, then when they're summarized at the level of the collective, the noise of each interaction drops out and the distilled signal is all that remains.
One of the reasons the querystream is such a powerful ranking force for search engines is that each user's querystream is private.
Transactions in an economy actually have consequences, so they are an authentic signal, even if they are (somewhat) public.
Contrast that with social media likes, which are free to give, are mostly public, and have no direct consequences for the giver.
If there's no cost to them doing it, then the signal is superficial and performative.