Someone who knows how to do all of those things, already knows that they know how to do all of those things. Nobody who uses a one-stop-shop like Shopify is duped into thinking it's something revolutionary. Either it's not something they know how to do on their own, not something they think is worth the trouble to do on their own, or not something they could afford to pay someone like you to do.
It's not revolutionary, but even with the stated two days of work in the original comment, you probably are spending a couple years worth of dollars compared to just using Shopify ignoring the time to find said developer, maintain the relationship if something goes wrong, etc. if you are just trying to get an idea off the ground.
