A 0-vote is a waste of time. Like I said, I don't downvote things without good reason.
Re: flagging, the meaning got muddled when a downvote became a "flag" on the Steemit front end. I'm not going to conform to the front end UI's idea of using it solely for clear abuse. The concept was changed because idiot newbies were downvoting everything. You can see more on the topic in the comments of this post.