I don’t think lack of engagement alone is a huge issue, but in some cases it is just an additional indicator that an account is being used solely as a vote farm. I’m disappointed by fairly small amounts of engagement by a big account like David Pakman, but he continued sharing content religiously to Steem as an additional social media network even though it was mostly earning pennies. No real history of bid bot use, etc.
When you combine no engagement, bidbots, and using those bidbots after the post has already been live for several days, it’s a clear determination that an account is trying to quietly milk the voting system for profits that will harm Steem in the broader sense.