While I agree with you for the most part, there are times where I think the one fish limit is Needed. On some systems when fish start to push in big numbers the "Snaggers" come out in hords. I have memories of hiking into one of canyon holes on the Wind River in 2003. This hole was loaded with Tons of bright springers. The limit was two, but the fish were not on the bite at all. About 7 a group of guys come down and start fishing the tail out. With in minutes they had a couple of fish on. Most of us thought, "sweet the bite is finally on". So, myself and a buddy started moving our way down the hole, and noticed these guys were tossing heavy weigths, eggs, and 6-8' leaders. Every fish they hooked were snagged. Most not even anywhere near the mouth. We left just short of an all out brawl on the bank with these guys to get to the top of the canyon to call the authorities. These guys got to the top of the canyon just as we were leaving and they only had their limits. Even though they were snaggin f-ers they were not going to get caught with more than their limits.
In my opinion these fish most likely would not of been caught, but I can't imagine how many more would of been caught had the limit been higher.
_________________________
"Many go fishing all their lives without knowing that it is not fish they are after." - Henry David Thoreau