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@Oswald
Miso Soup is discussing modifying lower end parts unless I misunderstood?! to make them lighter.
For me as these parts are built to cost so there is room to alter them successfully. And i have done so myself with no issues. I will say I didn't randomly pepper the part with holes, I looked at what SRAM had done to the Red rear mech and applied the same additional material relief to a Rival mech.
I've also given an example where the manufacturer actually does just that and sells at a premium in TA further up the thread.
I agree you should consider the function of the part and the risk you are taking on longevity. There are also parts from a safety aspect i would not touch. But i believe even the top end FEA optimised parts are overbuilt.
An average pro can put out about 450w at threshold peaking at about 1400w in a sprint. The average 'joe' puts out about 220w at threshold eg the part the pro is riding maybe 2x stronger then needed by the average 'joe' before adding the design safety factor the manufacturer used for unusual loading which I'd guess is 1.4 x max load