Office and OneDrive work really well. The new files system is pretty functional and getting better. There’s a decent ecosystem of utility apps now. Pushbullet is pretty handy for example. For scripting Pythonista is awesome, and together with Working Copy has a decent Git work flow.

It really depends what your work is. My iPad is my main mobile computer. I do have a desktop, but use the iPad heavily. At work at various meetings there are regularly 2 to 5 of use taking notes or referring to material on iPads. Some with pencils, others with keyboard cases.

Of course it’s not right for everyone, it just needs to be really good at the things it’s good for. That’s all. If a laptop or Surface works better for you that’s cool.