No critique - I’m just trying to get a clearer picture:
I might be misunderstanding you, but do you’d like the On sale from your follows & collections site, but for other peoples’ collections? (Without having to replicate said collections in your own account)
And your other feature request is to hide games already connected to your account from featured/fresh lists and searches? (I can already tell you that the second one would have to be implemented as an option in the settings because people would wonder why they can’t find those games in the search otherwise.)