Yes, the problem of subject versus relevance is always going to be present with science. I'd propsose we have Astro Q&A, Gen Sci Q&A, Math Q&A (for people like me that need help with a formula) etc... but even then, my "physics" questions (which are very basic) still always lead to discussions related to astronomy.

Which is part of the problem; many threads can fit multiple forum subsections; and which it should best fit is often a judgement call ultimately made when a mod moves a thread. I'm unconvinced that the majority of "wrong section" posts are caused by poor forum organization. Of course, it should be noted that there's many times that I don't agree with a mod's decision to move a particular post.

Also also note that this isn't including the posts intentionally made in the wrong sections (For instance, someone throwing an ATM post into a mainstream section on purpose). You're always going to have that, no matter how you arrange things.

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I'm like one of those idiot savants...well, except for the savant part.
"In order to increase awareness of the homeless, security have been given binoculars."