No, but I find it's a lot more fluid when it is. Talking with a white board is much more time-efficient than typing aside from exchanging code/logs/etc, and why go through the trouble of video conference/screen share with all the myriad of things that can go wrong when I can just walk over to someone's desk (or have them walk over to mine) and point at the screen/draw on the white board? Even in individual offices I'd still rather walk over or have people walk over to me. Slack and such have the advantage when it comes to location flexibility/distributed workforce, but for effective active collaboration co-location is still king IMO. At the end of the day you're having a human conversation with someone, no point in adding unnecessary layers.
I think too many developers have a "shut up and let me code" mentality that ironically hurts their progress in any collaborative effort.