At the moment, not so far as I know. The challenge for any client is that Mastodon (right now) doesn't load entire threads unless you're on the same server as OP. Instead, the API object says the post is "in reply to this post." If no one on your server is following the post directly prior to that in the thread, then the chain is broken.
There's a bot called FediFetcher that an admin can install to pull in other toots in a thread. Vanilla Mastodon is already working on an effort to integrate this functionality directly but I don't know how soon it will be live.
There's a browser plugin called Substitoot that will pull in other parts of a thread provided you click on the next post up in the thread (in my experience this may take a few clicks).
Lastly, I hear that GoToSocial already pulls in the rest of the thread.
None of that does exactly what you asked for but it's a prerequisite to implementing what you're hoping for.
Being limited isn't that big a deal. My instance has them limited because of their lax moderation and an excess of reply guys. All it means is that I get a notification saying "Someone you might know sent you a notification" and I get to review and accept or deny the notification depending. Plus they have to request permission to follow me so I get to check them out before accepting.
I still have tons of mutuals on
.social
and I get new ones all the time. While each person making the choice about whether to accept notifications or follows from a particular user is going to make their own choices, I don't think it's particularly inconvenient.AfD sidebar
For their lack of adequate moderation capacity / interest,.social
has one topic they tend to over-react to. AfD sympathizing isn't that one thing. Not to suggest they're right here. I'd need the thread context and a better understanding of German to weigh in on that. Moderators are human and they're going to make a bad call eventually. I'm not in a position to guess whether they made a bad call here. AfD aren't just some normal political party, though.