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If you don't bottom balance your batteries you risk loosing the whole pack.
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Don't where you read this ? I never bottom balancing any pack I had, I never loose a whole pack
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When one battery goes dead at the bottom of it's capacity it takes all the others with it eventually.
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How ? Have you some link or discussion about this ?
On all defect pack I had the opportunity to see, the problem always came from the BMS, not doing correctly its low voltage or high voltage detection on one cell. Result : cell destroyed after some time because of multiple overcharging or over discharging without cutoff of the BMS.
But the BMS do its job on other cell, on which voltage cannot come out from the LVC/HVC threshold because in this case the BMS cutoff charge or discharge.
On these defect pack I seen, all other cell was alway good.