However, for other products, like foundation or lip color (as two examples), how it wears/breaks down is critical, whether it’s drying/hydrating, and so on are all things that can’t be known without at least wearing once. I also think that it’s more important to limit just how much new is incorporated, e.g. new primer, new foundation, new concealer, and powder together makes it harder to see what’s doing what and where compared to using one’s go-tos and then a new powder.