The Epic Games Store is barely even functional for video games. They haven't been able to implement table stakes features like reviews and a shopping cart, despite promising them for years now. Going wider and increasing its surface area even further doesn't really sound like a winning move.

User reviews are in the pipeline and shopping cart was added last year. And I doubt there were technical barriers that kept them from making this. Just a matter of other priorities on the store not immediately visible to western eyes (e.g., they have aggressively pursued regional pricing for the last 18 months).