I dont totally disagree with you on that, and you do make a good point. Its easy for a discussion to go off topic in a bad way - and fast.
However, just saying you like 5.2-5.5, and me saying I like 5.7-6.0 - without any explanations, reasons, examples, doesnt help all that much either. You may as well just ask for a simple vote and go with the majority. When you make recommendations with no explanation, or details on your reasoning, the person your giving the advice to has no basis to judge if you know what you're taking about or if you are just spouting crap, or repeating something they read on the internet and took at face vlaue
Thats not automatically a bad thing, but I have found that there are a lot of things that "everyone knows" about growing that are just not true, or at least not the set in stone thing that many think they are. Plus, as I said, this is a complex issue. I think you need to add additional info and have additional discussion to fully understand whats going on and to make a good decision.
I am a little biased though. I absolutely hate having people "moderate" my communications and/or threads. More often than not, threads get edited by someone trying to make them "more on topic", but it cuts them up, breaks the flow, and critical information gets lost. People do not stay "on topic" in real life. Trying to force them to do so on-line makes it worse more often than it helps. But thats just me