Maybe it is just my experience, but individual tracking (which is the sort of tracking under consideration here) does not seem to help, let alone be necessary.

Maybe it is just my experience, but individual tracking (which is the sort of tracking under consideration here) does not seem to help, let alone be necessary. I do not think I have ever found something of interest in things that have been pushed at me, and the only thing that helps navigating a massive catalog is more extensive-in-scope and discriminating search capabilities.