[rwmj]

You might equally ask why don't we all work remotely?

(Disclaimer: I work remotely, in a team of > 50% remote workers, and believe it works very well)

[BerislavLopac]

Because, in many cases, no kind of communication software can supplant the face-to-face interaction, especially when multiple people are involved. The best distributed teams I've worked with are those that organise live meetups at least every few months.