From Liquid to ecommerce, We just think shopify is just better. And honestly I just don't think there are any good ecommerce carts out there that can compete with Shopify's.

woocommerce is the best for ecommerce but it only works out of the box with their themes and tbh I dont like there themes and to integrate takes way to much css work.

Another reason is shopify's servers are all in one with your store which keeps it less confusing.