When we need to build reactive/real-time web apps or when we use SASS, and many more. Here are some examples: Laravel echo server is built with Node.js. Elixir is built with Node.js

I love Laravel. But Node.js is a good way to go. Even if you're using Laravel or other PHP apps, you still have to use Node.js in some ways

No. Use Javascript (Node.js) if you want to use callback functions.

I would love to see it. Is it available yet?

You should. Angular 2 is much better than Angular 1.

No, jQuery will never die. At least, typing $('#myID'); is faster than document.getElementById('myID'); anyway.

Go for Laravel. It's built on top of Symfony so you can use all the Symfony's features. Read this book (it's free) and see if you love Laravel: http://learninglaravel.net/laravelbook If you don't, then choose Phalcon. By the way, in my humble opinion, if you don't like Laravel, then go for Node.js.

It's great to hear that :)

Delete the app and code it again. Just kidding. The best way is to split your bundles into sections.

I use jQuery to update Vue objects. This method is fine. Any other solutions?