I use 4 apps.
Sometimes threads get very, very long. I don't have the time to scroll back.
Often, I see only a reply of a contact and based on that, I'd like to know what he was originally responding to. Efficiency.
I really don't want to klick and scroll in a thread, as I often have to. And, not rarely, that doesn't help either b/c I don't have the access rights, not being a follower of the original contributor.
BTW, I usually read: Notfications w/ or w/o...