I am once again astounded by how unreasonably effective FEP 1b12 is at federating content completely.
On NodeBB I have a list of "popular" topics, which is mainly populated based on number of posts within a given time period. For most content from Mastodon-based servers, this supplies a decent signal of a given topic's popularity. The more people you follow, the more effective it is, but overall it's pretty shit at getting you the whole conversation.
Enter 1b12, Lemmy's preferred federation method. Follow a community actor and you start receiving everything that happens in that community. Replies, likes, the whole lot.
It also absolutely dominates my popular feed. It's all Lemmy stuff now because the Mastodon stuff literally can't compare.
Albeit the SNR is a tad lower, so give and take...