Another thing is that it's often harder to write your question/problem in text as a message, when in verbal communication it's a lot easier (personally, YMMV). But having to organise calls to get that verbal communication is a pain.
A lot of folks are used to being lazy intra communications in an org, and imho, that shouldn't be an excuse to dissuade remote work when the benefits are incredibly clear. If you suck at comms or management in a more flexible work arrangement environment (which is okay! to get better at something you must first suck at it), it's time to get better.
Maybe a drop-in thing could work, like Clubhouse. But then that's kinda invading your privacy if you have to stay on that.
yes, we're finding that a lot of folks have deficient written communication skills.
another problem is that a lot of developers can type fast enough to program, but not actually type fast enough to productively use email/slack. that one surprised me!
i had a coworker right before covid started, who, you'd send him something in slack, and then watch the "JimBob is typing..." indicator flash on and off for 5 minutes. then he'd just show up at your door and say "no. five." or whatever the very brief answer was.
Also, there may be things that were said, but I may not remember, so I'll have to ask again for the information. With text, you can always go back to those messages and re-read them.