That makes sense, but I’m not sure that’s what the GP comment was talking about. For instance, both Samsung and non-Samsung Android devices have threaded/serial

That makes sense, but I’m not sure that’s what the GP comment was talking about. For instance, both Samsung and non-Samsung Android devices have threaded/serial message notifications (?) which are very helpful for conversations, whereas iOS still has the primitive notification-per-message system. I’ve learned to live without it now as I prefer iOS for its advantages, but I’m frequently expected to make sense of several notifications out of order for each conversation when one would suffice.