Something we haven't discussed here is that Reddit (except on niche or local subs) is just on a whole different scale than the Fediverse. The active subreddits have enough users that blocking 10 people from replying to you isn't gonna stop the hundreds of others who still would say the same things in response. Meanwhile on Piefed if I'm a lib and I block 10 leftist accounts then post about how the Tiananmen Square, it's way less likely for someone to come and post the full video.
In fact, it's even worse: if I'm one of the 10 people they blocked and I post the link (since it still appears that I can from the Lemmy side) then another leftist reading the thread from a Lemmy instance will see the reply and won't feel the need to post it themselves, but the Piefed users on the other side won't.