I've seen players not block defenders pre patch, but it was clear they were "attempting" to find somebody to block, usually you could see who they were keying on downfield or at the opposite end of the line (stupidly but thats another issue).
I've never seen what I'm seeing now where literally the blocker is just running straight down field after the snap, and I've played dozens of games, I think this is something new, of course I could be wrong but I have not seen this before.