Maybe you could fire off a slack and hope for the best, but you can't really guage when a good time for a chat can be.
Async communication is good but its not quite the same to try to meet someone over slack, out of the blue, like you might in the break room.
When we worked in the same office, the walk-in frequency was about the same.
The difference between the two is negligible though and not spending the extra 3h per day for commute and office lunch is night and day.
Notice how much people were talking in the first day of the war in Slack. In my experience being in a couple of slack workspaces (one for work, a couple from co-working hubs, 3 professional groups) in some people shared something, in one they created a channel for this, in some other there was one or two threads.
Now think about what was the state of almost all employees: I think the invasion was the main focus of everybody and also I assess the amount of work done these days on average is less than normal.
Now think about what is happening going into an office in that day: Everybody will talk about this. Every conversation will start with this, every chit chat before any meeting will start with that news.
If you remote communication is reflecting this then congrats your organization managed to create a good remote culture.
I am not saying one is good and one is bad. I am saying there is a big difference between them.
I wonder if there is confirmation bias in the opinions of people who are voluntarily spending a large amount of time on forums already. They had a preference for written asynchronous communication already.