This is cool, but I think you are overselling the privacy by saying silent payment addresses "can't be tracked." For example, suppose Bisq adds support for silent payment addresses (which would be a good thing btw) and I use the same SP address with two different sellers on Bisq. But unbeknownst to me, they are actually colluding, sting operators trying to collect info about Bisq users.

Such sting operators can compare notes and learn that the same person bought from Bisq twice, because they both sent money to the same SP address. That allows them to do some tracking that they *couldn't* do if I had avoided SP address reuse.

I think it is unwise to generally recommend reusing SP addresses without fear of tracking. Their utility is real, but more nuanced than tha, and simplifications like "A reusable address that can't be tracked."