分离DOM托管和逻辑API的优点/缺点

So, I can now say that I'm more than just a beginner developer, I've been working as a junior developer full time for over a year now, with my main focus being on Laravel, and I like it.

I have also learned about Angular.js and absolutely love it.

I have an idea, but I'm not sure if it's very practical. And asking questions that end in opinionated answers is frowned upon, so I'll try to keep this as factual as possible.

I'm considering developing two separate Laravel applications. One that would host the DOM HTML and JavaScript for my Angular application, and another that would interact with it via Json with an API key that would be responsible for interacting with the database and the logistical analysis of the data.

What would be some security concerns with doing this over a standard Laravel/Bootstrap application? Is there a good potential for an increase in performance as I suspect? What are some of the other Advantages/Disadvantages I probably haven't considered yet?