If we create a separate section for monitor/lcd, what's the point in having a peripherals section? Its not as if peripherals section is a subsection- but a main one. Today lcd- tomorrow keyboard, mouse, add-on cards, power supplies, mousepads, etc.
Point is keeping categories bring a form or order and organizes sections. Implementing too many section= too many complication. We do have a consumer section where people talk about lcd and plasma. Right now there are too many people asking about advice for AC- despite the fact most of the advices are same. It doesn't mean one will create separate section for air conditioners- right? If people check other people's queries in a way their queries can be resolved- but people conviniently ignore the search button, and rather waste their time on putting a thread.