These are certainly good points and valid problems, but "leaving it to a pro" as the OP suggests doesn't fix them. That pro will likely use WordPress or Shopify anyway. Until someone makes a CDN that isn't siloed and truly separates content from presentation, this won't be fixed. Almost no one can afford to build a complex e-commerce site from scratch and, if they did, it wouldn't be portable or re-usable, either.
I don't see nothing wrong with using WordPress or Shopify, as long as the content is saved stored as it was designed. Once you introduce the page builder, your content becomes unusable. At least that's how I see it.
