I was never a big fan of twitter/mastodon random personal ramblings that would fill my feed so I was naturally very skeptical of the microblogging feature in kbin, but honestly... it kinda makes sense here!
If I'm on a magazine for some game like elden ring, for example, it makes sense to keep threads for big threaded conversations while using the microblog for just small thoughts, tips, screenshots, for sharing personal accomplishments or smaller things like that which don't usually create big discussions. If I need to ask a quick question I can just make a microblog post and maybe get answers even from people using mastodon that aren't on kbin or lemmy!
I'm mostly repeating what you said, I know, but just wanted to gush about it a bit, it's a pretty cool idea.