@kensanata I think this is currently the biggest shortcoming #Mastodon (#fediverse in general?) has. Mostly just the original poster sees the whole #thread. It creates a lot of duplicate comments etc. I'd prefer if the client would automatically fetch it for me when I expand the post.
It's why I open most posts via permalinks to see the whole threads from the source server. Being on a #single-user #instance, most posts I see have zero comments even after subscribing to all relays I've found.