I'm really sorry no one had an opinion on this, or just hasn't shared.I wanted to share what I received from our product team,regarding what they were thinking when looking for a possible solution:
"With BigCommerce we can provide customers with more robust online store capabilities. While we realize most of the major ecommerce carts would have solved our customers pain points we decided to partner with BigCommerce for a variety of reasons, including their position for being at the forefront of omni-channel selling, and offering small businesses a full-featured online store at the base price (their pricing model is focused on sales volume, not features). Amongst other benefits, customers will also have a hub for multi-channel selling (online store, physical store, online marketplace, and social media) where they can manage all of their inventory in one place."
I hope this is helpful, and also hope this might prompt some discussion around your question.
Please let me know if you have any additional questions for us, I'd be happy to help.