I would disagree, because they're still visible and still structurally part of the same conversation, meaning people reading the conversation will read those tangents, or at the very least be distracted by them.
(Unless the tangent leads toward a mind-killing subject like politics. I'm 100% behind you on applying careful consideration before making a tangent from a technical topic to an emotionally-charged one; people see that kind of subthread and never even make it to the rest of the subthreads in the same conversation.)