(only necessary when it's health depletes after years)
Incorrect. I replace them when they need charging. Pop the ones in the controller out, pop them on the charger, and pop freshly-charged ones in. 5 seconds.
I can change a the custom battery in my camera as quickly as any AA.
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That is obviously not the case with the Steam controller.
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you now need to buy special batteries from a particular source that likely won't even be available for purchase 5-10 years on. Whereas AA are ubiquitous and can buy them from hundreds of vendors, and likely will be able to indefinitely.
Just because you don't understand it doesn't mean I've "failed to explain" it. I've explained it over and over at this point.