YEs, I agree, to a degree. I do believe I wrote the same sentiment. But I could be wrong. The raw numbers I mentioned earlier and show are not the whole story. Also, if the compression ratio is more complementive to the cam and cars set up, it will be noticed. But it is very small. Very! Did I not say this. Is this not what your stating?
Now you confused the hell of of me... but that is not hard LOL. CR is important regardless of cam.... Gee, if CR did not matter, we would all run 6:1 and use 55 octane gas.... or coal gas... or cow methane.... or anything that would burn. LOL
For a low RPM, torquey street engine, it will show up by extending the bottom end RPM range, and also in combustion efficiency (power extraction per cycle) and thus help mileage. The older guys here all know firsthand what happened with the mid 70's engines when the CR was lowered to reduce peak compression temps and thus NoX emissions: torque, power and mileage all suffered. And really, the same applies for high RPM drag engines: SCR is boosted way up to make up for the loss of DCR with the wild cams.
So, that is not what I am saying as far as being noticeable.... I'll just go back to my direct experience with changing CR 3 times in increments of about 0.4 or 0.5 in the small engine; the effect was VERY noticeable each step. And again, it was felt at the low end, not at peak HP. For some applications, a big increase in low end torque is very important; street operation is one (perhaps excluding street drag racing). My race engines are for rallying, and there is only one important torque RPM range: ALL OF THEM! You're making 100-2o0 turns per the typical stage, all of them of different radii and speeds, and so a broad torque band is a key engine parameter.
I am going to blame all of this on Rani and his seemingly innocent questions LOL