The majority of forum users are pleasant, thoughtful, and helpful. However, there are a significant number that are anything but. Unfortunately, many of them are among the more active forum participants. Some consistently take threads off topic and/or engage in off-topic back-and-forth conversations within the thread. Some wantonly present misinformation, or their own ill-considered speculation, as confirmed facts. Some simply spend far more time typing than thinking about what they're typing. Some are just immature, rude, or abusive.
However they they do it, they make it more burdensome to find information or thoughtful discussion on these forums. I don't mind if these people do their thing, or have signatures. I don't want to prevent people from saying what they want or 'Report' them for content that isn't objectively harmful. I'd just appreciate a functional way to keep them from muddling my screen while I use the forums.