Yes, those features are very useful. But they require a) the user to be aware of them and b) clicking to reveal the context
Late replies without quoting can make a topic can look confusing to the layman. Example (the “yes me” in the below topic, which references a post made earlier in the topic):
I’d suggest Discourse should have auto-quoted the “yes me” post, but avoided auto-quoting the “count me in too Chris”, as this reply came soon after its target post.