I've seen hints of backfill working really well, but hadn't seen good examples until recently. As more and more instances upgrade to the newer versions of Mastodon that support context, backfill from Mastodon instances will improve across the board.
Today one of the most popular topics on my NodeBB instance was an update from the admin of The Forkiverse, a brand new up-and-coming instance. Despite following only one person from that instance, I was able to see every single reply from that instance, even from users I don't follow.
Super stoked to see resolvable contexts and backfill working in the wild. Who says the Fediverse is quiet? Not me, anymore 
