This right here is the main reason. A lot of it depends on how you normally communicate with that person and whether getting together in person to do it is a major inconvenience.
We fired our guitar player in person. We wanted to do it as a group at a rehearsal (which I now think would have been in bad form; see above quote) but he cancelled that week (gee, why were we firing him again?) so our LS decided to go out to his place and deliver the news. He set up a meeting, etc. etc. Would have been better in this case if we'd all been there because it felt like the rest of us were avoiding the discomfort. But no one wanted to wait another week.
Post Covid hiatus it was decided that we wouldn't be inviting our drummer back to resume work with us. We hadn't seen one another in months; the drummer was a good friend of mine and almost all of our communication for several months had been text only. Since we are close I volunteered to be the one to tell him that they all wanted to "move in a different direction." I texted him, because he lives 35 minutes away and there was no reason to turn it into a big, dramatic moment where one or the other of us had to make a long trip for bad news. He understood our reasons and it was not unexpected. We're still friends and there's been no damage to our relationship.
So, it depends.