Why the iPad became Federico's main computer

Good post by Federico Viticci on MacStories:

Therefore, three months after I bought an iPad Air 2 and three years into my iPad-as-a-computer experiment, I'd like to offer some thoughts on my current iPad setup and how the device has changed my computing habits.

Because not only do I know what the iPad is good for in my life – the iPad Air 2 finally let me replace my aging MacBook Air as my main computer.

If someone like Federico can use an iPad as his main computer, than the argument that iPad isn't a serious computing device goes out the window.