We're not going to agree--you think you're right from your experience and I think I'm right from my experience.
I know manufacturing and dealing direct with them because that's what I did with auto parts and I recognize the exact same patterns in all other industries--it's the same. And you don't know manufacturing if you don't think a .005 cent part cost difference is worth changing stuff up over.
It's trivial to change the capacitor for a particular run of parts and then switch back if it saves thousands. Hell, the cheap crap brands are taking it to a whole new level by putting in quality parts to get their name out and then swapping to garbage parts once sales start even when the performance is not the same--this is technically bait and switch. But if these companies were selling these lesser parts under a different brand, coming off the same line, they would be considered 'aftermarket' parts. And generally this is how it happens and how it is done--with aftermarket parts usually inferior to the originals. The few exceptions I've run into this was by the company KYB in their struts for the 1995 Nissan Altima. KYB made the Nissan parts and the aftermarket, and there were 4 Nissan parts for each wheel based on the trim level, abs/non-abs, and transmission, and KYB's aftermarket was just one made to stronger specifications and with a lifetime warranty versus Nissan's normal 12k/1yr.
My dad worked as an automotive engineer at Ford and he told me that every single new model by every single manufacturer had two part numbers--the 'initial quality' one that got the car selling and then the 'secondary vendor' that they swapped over to once they started moving cars to make more profit--and this was in the 1970-1980s. It's still the same today in every industry, especially with the watch on the bottom line and automated manufacturing. Even Lenovo's own part system has this built into their part numbers, the original part number and the FRU or 'field replacement unit'. Technically these should be the same thing, but if there's a way to save costs on a part, the good companies track that with a change in the part number and Lenovo goes one step further by assigning it a different number from the start.
You can buy oem stuff all day long and think it's the same quality, but there's a reason why I went to the dealership to buy a new Honda radiator when I had a warehouse full of aftermarket parts--there IS a difference. And its the same reason why for a proprietary part like a custom oem power supply, I get it from the oem. Aside from ram, storage, and cpus/gpus, there's little that I would try to get direct from the oems for a branded custom designed system.
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