Big systems - Little rooms

I enjoy browsing the Virtual Systems posted online here ( and have posted my own).  I am puzzled , however, by the too common practice of placing large ( and usually expensive) speakers into very tight confines, often less than a foot from the front wall and barely more from the side walls.  Presumably the sitting position is likely against the back wall.  Many of these systems also have significant power and expensive source components.  While I may be as susceptible as most to upgradeitis, I have tried to give some recognition to the size of my listening space in my equipment selection.  Have I overlooked some new approach to managing room acoustics, or are most speakers not as sensitive as some articles describe to position within the room.  It would otherwise seem that these systems might benefit from  a bit of downsizing to achieve superior sound imaging.