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This is true for NiCd batteries, not for Li-ion. In general, LiIon degrades at a rate roughly linear to state of charge when not in use.

IIRC, the danger with storing lithium batteries at a low SoC is that they do have some small amount of self-discharge and can eventually drop to levels that cause severe degradation - and potentially catastrophic failure when next charged.

This depends entirely on battery chemistry and is different for each one.

Lithium ion batteries want to be stored at low charge and cold. As long as they don’t self discharge below a certain minimum (at which point they are dead forever) you minimize degradation by keeping charge as low as possible. No need to be obsessive about it because the difference between 5% and 50% isn’t much.

Other lithium chemistries want to be stored completely charged, NiCd wants to be about half. Temperature is usually worse than charge state anyway.

Get thee behind me, Satan. The machine is there for me; I am not there for the machine. If tending to my productivity and mental health means replacing a battery every second year instead of every third, then I'm going to pick me over a $35 battery.