Thanks for the link - it's linked in the post as well, certainly interesting to know. We also have someone working at our company who previously worked at 1Password and is really happy that he can use Slack again.
I understand your preference for face-to-face but one reason some prefer text chat is to minimize the ambient noise level in the office so as to not disturb others.
For me, one problem with face-to-face (and voice calls) is I often end up having to take notes and transcribe what the person is saying to me. Instead, if you just send me a text chat or email, it saves me the step of being your secretary to type in what you just told me.