I for one disagree with some of the sentiments expressed in those "policies", or at least the way in which they're expressed.
"Don't name one particular person!"
I think the question
Why is Rob Bell's book, "Love Wins", controversial; which church groups endorse it and which think it is theologically unsound? would be a good one (I might even go ahead and ask it, I haven't yet asked any questions other than on Meta!) but of course it names a particular person. "Don't name a particular person" is of course nonsense for Christianity.SE if taken literally; after all, Jesus is a particular person, isn't he?
Arguably you could ask this question in a different way, without mention of Rob Bell - but doing so would require a lot more subject knowledge, almost to the extent that the question-asker would be able to answer their own question - which kind of defeats the object of asking it.
"Oh and we can't generalize to all Christians, that's too broad."
Why? While there are lots of opinions within Christianity, there are equally lots of things that apply to all of us. There can be no hard and fast rule here.
What's every Christian's favourite colour? is clearly unanswerable, but
Do Christians believe in God?, while incredibly trivial, is something that can be answered very easily.
"And don't ask a question about an arbitrary subgroup of some Christians, it needs to be a specific group."
"Well, even asking about a specific group, there are several people in the group and so there might be differences of opinion!"
Certainly in my experience there is more difference of opinion, and even fundamental doctrine, within denominations than between them. Also what counts as a specific group as opposed to an arbitrary subgroup? I agree with the sentiment that questions beginning "Some Christians say..." without actually giving a source or an actual frame of reference is unhelpful - but how specific is specific? There's almost, if not just as much, variety amongst "all Anglicans" or "all Baptists" as there is among "all Christians". As I say, I agree with what this is getting at but if it's to become site policy it needs to be worded much more thoughtfully.
"And don't ask a question about yourself, either."
I can't fault this one, we're not an agony-aunt site and so aren't here to give specific pastoral advice. Having said that, there are some questions that can be phrased as "about me" questions that are actually general and apply to everyone, so again we need to get the wording right.
As the OP implies, the more rules we make, the harder we make it for people to use the site. Let's try not to shoot ourselves in the foot in this way.