You can do those things, but you're not going to capture the effect that you want. Renders happen frequently, and the render process will complete before your `fetch` resolves. As for alert, the alert will pop up immediately before the render is applied to the DOM- and will likely pop up many times more than you thought it would, assuming you're popping it up based on some state variable.
In short, you can do those things maliciously, but if you do them naively it is immediately obvious when you run the code that it's not correct.
Compare that to the original analogy to mixing raw PHP and HTML templates. Since the rendering process is blocking, you can easily stuff form handling, remote API calls, and database calls in amongst your markup, and can make it "work" even if it's not clean.
Even Laravel's blade components let you write custom components and helpers in PHP which can do all of those things from the template- you just don't see the actual SQL mixed with the HTML in the same file. The problem is still there, just now it is harder to see.
In short, you can do those things maliciously, but if you do them naively it is immediately obvious when you run the code that it's not correct.
Compare that to the original analogy to mixing raw PHP and HTML templates. Since the rendering process is blocking, you can easily stuff form handling, remote API calls, and database calls in amongst your markup, and can make it "work" even if it's not clean.
Even Laravel's blade components let you write custom components and helpers in PHP which can do all of those things from the template- you just don't see the actual SQL mixed with the HTML in the same file. The problem is still there, just now it is harder to see.