I found your question/answer ( https://superuser.com/questions/838025/how-fast-does-application-response-time-need-to-be )
quite interesting. It's factual, helpful, and just plain interesting, so to me that's on topic. I'll go upvote in a moment.

I'd say that ( https://superuser.com/questions/840632/why-do-i-sometimes-type-the-as-teh-mean-that-the-response-of-keyboard-is-too )
, while not greatly phrased, is on-topic, because the user is asking if a hardware issue is causing the typos. I don't agree with why it was closed. However I think it 
was rightfully closed, because in addition to poor phrasing it wasn't generating good answers. No different than closing
an acceptable question that ends up generating nothing but opinion-based answers. 

Based on the 2 examples given I really don't see the alleged gray-area *(not saying it isn't there)*, but setting that 
aside, I agree with you that `You can't talk about the hardware or user interface and exclude half of the equation.` 
I'd say if it is a question that a reasonable google search can't solve, and it can be factually answered with answers 
that are worth their weight-in-bytes, it's on topic.