Anyone think of how much of a clusterfuck the adoption of 7.62x51 NATO was?

Given how the original Soviet concept of their assault rifles was basically bigger PPSh/PPS and the US and their allies should have access to similar data due to their experiences in WW2 (island hopping and all) , whose bright idea it was in the US to adopt a full power rifle round for weapons systems to replace the SMG,LMG, carbine and service rifle and then force it down the throats of NATO?

The British told the US that a full power rifle round would be near uncontrollable in full auto in their tests but no....the US had a case of 'not made here'.

And yeah, I think the M14 should had been a 'M2 carbine but firing a bigger immediate round' in concept rather than a weapon system to replace the submachine gun, light machine gun, M1 Garand and carbine in concept.