I don’t think this is a fair shake. I don’t think Shopify is the only competent option in this space, however they have been very innovative:
They were one of the first with broad API integrations and not just a take or leave it storefront.
They have both REST and GraphQL integrations for the HN type crowd
They have an entire framework for heavily customized storefronts, Hydrogen[0]
They have Shop, their Amazon style discovery equivalent for smaller shops.
They have a good app marketplace for integrations
And a lot more.