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There is a huge science out there in making metal parts. It is a whole lot more complicated than some may think.
There may be a huge difference in strength between the AR-15 receivers. However if the service doesn't require that extra strength it makes no difference in that service and adds no value. Just because a CNC billet part is a waste on money in that particular service does not mean there is no difference in the two manufacturing processes and either can be used in any application.
The crankshaft that broke may well have lasted 200K miles in an engine with 150 lb-ft less torque and the revs limited 1000 rpm lower. Until you exceed a parts capability, it will perform perfectly.
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