This is great advice; it's how our team functions, being 100% remote, but are leasing space that we come to if a team ever wants to sit together in person. It's available, but managers have made it clear it's by no means compulsory.

So, we have off-topic channels, a channel to plan social events (I Live in Austin Texas and we have more than one musician who will post events, and we've made company outings out of going to see a coworker perform), there's one for movie chats, and even a "LFG" (Looking for games) channel for the folks who like to play and discuss video games.

They're all as active and vibrant as our #devops and #product-discussions channels.