I agree that that's a problem but this is the wrong solution. Letting the blockee see the blocker doesn't help them correct the record if the blocker has repli

I agree that that's a problem but this is the wrong solution. Letting the blockee see the blocker doesn't help them correct the record if the blocker has replied to them before blocking. They're still not permitted to reply. You can unblock-reply-block and do that all day under either model. Imho the right answer is just to a) Hide the blocker's replies to the blockee in an expand-to-view mode (like Twitter's View Hidden Replies feature) so that in a large conversation the non-blocking parties are the emphasized ones. and b) When shown explain that the reply was hidden because the reply-er has blocked the reply-ee. I assume they want to make blocking semi-secret so it's not showing dirty laundry all over twitter to people who aren't involved in the feud, but either way if party A and B had an argument and then one side unilaterally prevents the other from continuing it, that should made visible to the reader.