Questions related to blocking users and domains.

I've noticed a few things when blocking users.

1. If i block user A, then any post/thread by that user A is not shown. So lets say a thread has posts by user A and other people respond to him, all the replies to user A are hidden and only other peoples replies in the thread is visible.

2. If user A made link posts, they are all hidden including every reply to his thread.

When blocking a domain, i see that communities from that domain still show up in all. I'm confused how to block all communities from a particular domain.

Instead of completely hiding the threads, links and replies to banned users, can the blocked user's post/replies/threads be replaced with a spoiler that the user is blocked in preferences?