"My point is that, in practice, such massive sensor size differences are not common and often do not even ensure significant low light differences."
Actually in practice, such massive sensor size differences ARE common and of course they will ensure significant low light differences. You just concurred with this in your previous post!!!! And with Pelco at 1/6.9" sensor, the 'massive sensor size' differences, arguably, may just become more common!
Really? where are you going with this......actually forget that....no need to answer. Take a week off and step outside the box!! Trust me, it works!!
Let's say you are my optometrist client that I installed for today. He knows he is not tech savy, he was looking at cameras online and just gave up due to the hundreds of different products with numerous spec sheets etc, etc...
However, there are thousands of folks shopping online 24/7 who are buying thousands of cameras like the ones below because price for the most part, will influence their decision, when in fact, if they had more knowledge they would likely choose a camera with the larger sensor. Now, they will still probably be happy but they might have been a whole lot happier if the camera had a 1/2.7" sensor instead of the 1/4".
Once again, my opening point was valid. I was not looking to debate an issue that serves no purpose other than the fact you seem to want to have the last word. Anyway, the next two are my last!!
GE Security TVD-M2210W-4-N TruVISION Outdoor 2MP with 1/4" CMOS sensor
H.264 Hi3507 2MP HD 1/4" CMOS SENSOR Array IR LED Dome Camera
KL-D841H-2MP HD 1600*1200 DOME 4/6mm 1/4" CMOS SENSOR PROGRESSIVE SCAN, SUPPORT WDR