Wouldn’t it be helpful to indicate when a user has been blocked?

Even if you knew the date and time, that doesn't mean you know the reason. You'd have to have something like *the user was looking at this post and then blocked you.* or *the user was on page two of your groups and then blocked you. * Since the purpose of blocking someone is to end interactions, then supplying the blocked person with a ton of very specific info is counter to the intent.