The AC in my R134 Acura TL blows cold. I don't smoke because I like a cancer-free lifestyle, but it takes less time than my emphysematic grandmother takes to smoke a cigarette for the AC to have it down to 70.
The AC in my 1993 MR2 was R12, and I had it converted several years back to R134. I can't run it on high for very long without getting much too cold.
If your AC isn't cooling properly, it's not because of the R134. It's either because the system is designed poorly or because you have a leak and have lost enough coolant to render the system ineffective.
With the exception of Vietnam, Korea, Red Cloud's War, Laos, Bay of Pigs, Lebanon, Somalia, the Russian civil war, the Powder River War, and the War of 1812, you're absolutely right.