When Chrome 1.0 came out in 2008, it only ran on Windows, and it couldn't do basic things like print or export to PDF, didn't have any accessibility, didn't work in RTL languages, and didn't have any graphics acceleration, among other limitations. Don't get me wrong, it was a marvelous piece of engineering - but it was extremely incomplete. By the time it was what we think of as a modern, complete browser, they had many hundreds of engineers working on it.
Also, you're comparing the number of engineers working on one product, to the number of engineers working at Shopify across their entire company today, which includes far more than just one app.
You're entitled to your opinion that Shopify is a poor app or that it's overengineered, but clearly it's not simple. That's just a fact. If it looks like a simple app to you, that's because you're not seeing most of it.
It's like looking at the YouTube mobile app as someone who watches videos and saying that the app frontend looks simple. You're only seeing 5% of the app. The other 95% is for video creators and advertisers, and it is decidedly NOT simple. I think that's the same here.