[Withano]

I only used it once about a year ago.. all it done was take away my ability to respond to that one persons post, whilst they still responded to many of mine..
I do have a mental note of a few people that I actively try to avoid, that works better for me

I guess the moderators pass on information about the site such as scheduled downtime or your personal infractions, and warnings to desist entire conversations within threads, so maybe its just logistically difficult - there would be a huge fuss made if somebody never saw a warning because of the block feature, and then was banned because they carried on