[okanesen]

Switching applications via alt+tab does cause some distraction for me personally, as I have to _adapt_ to a new environment, because every application differs in its overall appearance and the way how I it is used. Whereas in Emacs you just use one application and everything else feels kind of the same.

Moreover, I don't think that you can do something like manage your to-do list and reference an email directly between different applications but you can do that inside Emacs. This way I don't need to first search inside another email application which email I'm referencing to inside of that to-do list item.

I guess at the end of the day it just boils down to use whatever fits the job perfectly, whether it's combining different applications or use everything inside Emacs. Whatever makes you more productive.