Agreed. Hiding history has become a negative signal or, really since it's so common to hide, open history is a positive signal.
There used to be bots that summarized an account's posts. One, I think it was usersimulator, was particularly amusing as it ran a markov chain over the account and generated a fresh post in the style of that user. Quite telling.
I still use reddit but I tag accounts using RES and sometimes see the same bad apples turn up in other subreddits.