each are adequate for the price. as said there are cost levels
made to meet a target price point of the whole bike.

That choice is the Product Manager's decision.

most are a product of a fully automated manufacturing process .
to make millions of them to supply the factories building bikes.

the bottom line price is a mix of the parts list ..

sometimes a nicer piece is featured at the trade off of a simpler few elsewhere.

but the total cost remains the same. the target price chosen.