Outside of work, I use whatever channel people interact with me on. That's largely SMS, various chat apps, and some e-mail, and a fair amount of voice.
I like talking to people who I value. Like that a lot.
For work, or anything with complexity in any major axis, time, number of elements, etc... I continue to use e-mail.
The best thing about that is being able to go back into those e-mails and recover info. My archive goes almost all the way back, and the little bit I don't have in there really doesn't matter much. Surprisingly, the rest has more times than I can count.
People can contact me, literally decades later, and it's there, I can spool it up, and act on whatever it is almost as if I never missed a beat.
Maybe when the new tools are around and endure in a similar fashion I would reconsider. Kind of hard to do so in such an open, portable format though.