So now we are going to spend more on development and probably rework because the developer decided he was just going to wrap the website in a webview and call it a “mobile app” because he didn’t think through these scenarios. Anytime that you have to go through the development -> QA cycle more then once it costs money and time.

That’s kind of my point. Learning a language is easy and for the most part useless without knowing the frameworks and architectural best practices.

I don’t know what Android has, but iOS has built in frameworks for handling syncing. If an Android developer didn’t know all of the built in frameworks available to them and re-invented the wheel, that would also be a waste of money.