I’m all in with Questions as long as we control it. That means, having a public Q/A section for each product, the Q/A offering popular questions with answers that only the Seller can edit at any time. The main feature: That Customers cannot ask direct questions, only see the posted Q/A. This helps avoid bullies and cheap Devs trashing products to lower prices.
If the Customer doesn’t see his/her question, they can send an Email. Problem solve, everyones happy.