I think that's precisely why the ramblings should be a separate channel apart from all the emails and more serious communication, but I have some thoughts why this still might not work.
I used to be guilty of leaving walls of text in our "random" channel, and we weren't even remote back then. My reasons weren't entirely irrational. Most of the time I felt like I wasn't taken seriously because of the way the business was run and it was the only chance I had to speak "out of turn". These workplaces that encourage a lack of boundaries are usually small startups that hire inexperienced people. Ultimately whatever anyone said was used to manipulate them or for the rotten parts of middle management to "steal" ideas.
I'm not a fan of this concept either and I think it's easily abused by all.
I guess, maybe unprofessional might mean short essays but I'd like to work somewhere that supports such behaviours if I am being honest.
I just really feel like its so hard convincing a single person anything or let alone the world. What are your thoughts?