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If we drop all of the things not useful to developers (or actively get in the way) I'm left with:

Logically, at least some of the 1500 ready made adons must do something that is hard to make yourself. The downside is that you have to pay and that writing things (not available in their app store) yourself might be hard to impossible.

They offer SEO tools which (I hear) are quite good. End of the day yours is just another shoppify shop which makes it hard to compete with others doing the same thing on the same platform. WooCommerce is argued to provide better results. I have no idea how a self made website compares.

Integration with accounting software, shipping providers and payment processors out of the box is kinda nice but one should be able to figure this out.

There are also hundreds (joking) of downsides that I'm not able to judge.

Overall it seems a good solution if your store isn't to small and isn't to big. It might be fun using it to buy time while you transition from small custom to a large custom solution.