I built my own cart as a learning exercise, but I don't recommend going down that path unless you are also looking to brush up React skills or learn/challenge yourself. Based on the use-shopping-cart documentations it looks sufficient for typical shopping cart use cases and would make more sense for production/clients
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On your demo, are you using Stripe's use-shopping-cart or did you create your own React cart?
I built my own cart as a learning exercise, but I don't recommend going down that path unless you are also looking to brush up React skills or learn/challenge yourself. Based on the use-shopping-cart documentations it looks sufficient for typical shopping cart use cases and would make more sense for production/clients