Wow, thanks for very exhaustive answer!
The reason I asked this questions was quite mundane and simple.
You basically answered it all indirectly hence I want to reiterate here (I got to stop trying to use this puffed up language

)
The way I seee it is as follows:
1. First general group of ppl as described by unregistered as 'wannabe DESIGNERS' (that explains why you are here unregistered - j/k). These peaople need 'absolute' type of testing providing them with the most accurate data available using well described and documented scientific testing methodology (sealed chamber with full enviro control-doable at low cost at home, fully controled heat sources of different heat transfer size surface, top quality heat dissipation assembly to remove this type of possible limitation).
Experimental data obtained in this way could be of great use to wannabe designers.
2. Second group of peaople (VAST majority) are enthusiasts wanting to install a water cooling assy in their machines and looking for advice.
In my opinion this requires totally different approach. To describe it as simple as possible such testing would require 'filed conditions emulation' or to rephrase 'how an average enthusiast would put together a kit and use it' type of approach. Use of top quality measuring equipment and clearly stated methodology is also a must here.
I think such an approach would show potential users how different kits, pieces of hardware would perform comparatively if put together according to mfgrs reccomendations and manuals.
unregistered, are you catching my drift here? (LOL)
What do you think, is it feasible approach or rather not very practical?
Jabo