This does come back to money though. If you are, on average, only trashing assets let's say every other turn, then there is a pretty clear 1:1 between scrubber and other drip economy cards that might slot in better than a silver bullet. And to that point, is trashing assets fundamentally worth an influence and a silver bullet slot? Net Celebrity helps trash assets, but also helps you use SMC/Clone chip/run on centrals, etc. You're going to find that utility, I would say, more useful than a scrubber.
A sahasrara would help you play the economy game with asset heavy decks, while being able to at least coop its losses before you trash it if you're not being strapped for cash.
Point being is that I just don't think shaper really ever needs scrubber (and there is paricia, though in your case you're more worried about SSCG, which is reasonable) and we have seen top decks take a singleton Paricia in the past, you can tutor it out when needed, and you rarely need more than 1 tabled anyway. Giving up 1 card and no influence for an almost equal silver bullet (but it is cheaper to get out) is a much easier pill to swallow for me than 3 cards and 3 inf