Welcome to Christianity.SE, Fred! I completely understand your frustration.
Part of the problem is the nature of Stack Exchange websites, of which Christianity.SE is a part. They originated with StackOverflow.com, a site dedicated to asking and answering questions about (basically) programming. That's a world that enjoys a great deal of definitiveness1. Consequently, they created a website using a one-question-one-best-answer model.
In short, StackOverflow was not and is not a discussion forum.
Unfortunately, when it comes to philosophy in general, religion in specific, and Christianity perhaps most of all — what most people expect is a discussion forum. As I understand it, early on in Christianity.SE's life (while it was establishing its identity), there was a fair amount of arguing. My two favorite Meta comments in this regard is Korvin Starmast's observation that we're really not interested in the 1900 year shouting match and Flimzy's observation that we can't handle the truth, meaning that questions of "who's right" are not what this site is about.
How does this relate to your question about overview questions?
Honestly, overview questions, while permissible, rarely work. They must generally be very narrow such that a single person can provide the overview. In my own limited experience with the site, it's simpler (and, frankly, more productive) to ask the same question 2-5 times, once for each denominational point of view you're looking for.
Remember, that one-question-one-best-answer model is a killer for overview questions. The moment you open the door to "anyone can provide an answer from their own denomination's point of view" the general populace quickly reverts back to the 1900-year-old shouting match, which we do because we as a group (and with all the love in the world) can't handle the truth that we have (sometimes very) divergent beliefs.
If you're tempted to ask an overview question:
Ask yourself if the topic is very, very narrow, or not. For example, I believe "What is an overview of the methods of baptism within Christianity?" might be narrow enough.
Consider asking for a biblical justification rather than everybody's beliefs or opinions. "What is the biblical basis for immersion baptism?"
And if all else fails, ask a single question for each denomination you want to hear from.
1 If that's a word, but I'm sure you get my point.