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Although I agree with you in some ways, there are things like SSDs that are overprovisioned so they have a bit of extra space that they can use as the flash degrades.

Not having that extra space will dramatically lower the lifespan and reliability of the drive. Same with these batteries.

They just need to be honest about what they're selling.

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Aye but with my samsung SSD it's up to me how much overprovisioning there is and I can choose to disable it like

I'd rather have the manufacturer decide. They should know more about the reliability of their own device than a consumer possibly could.

I have a Samsung SSD. How do I know how much to overprovision? 100Mb? 200Mb? 1000Mb?? How would I know?

When they sell an SSD as, say, 2Tb but then I'm expected to assign 20Gb of that just for reliability, that's materially worse than a drive that advertises 2Tb but doesn't count the overprovisioning. But they're both advertised as 2Tb.

If they're selling a 2Tb drive, it should work as a (reliable) 2Tb drive.

Just like hard drives that manage bad blocks themselves.

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