Hot Swapping batteries is actually surprisingly good for the life of the battery if done well.

Rapid charging the battery does do permenant damage over time especially if you fast charge every time. Whereas if you can hot swap a battery and have a suitable stockpile of them you can trickle charge the battery over a couple of hours instead of 30 mins and prolong the overall lifespan of the battery. Even slowing down the charge rate to 1 hour reduces wear on the battery significantly. Plus, without time pressure from a customer, more time could be taken to replace damaged cells or blocks in a battery so that one pack will more effectively use the whole battery up instead of throwing away perfectly good cells.

Why would you buy a 25tb HDD. Have they never heard of RAID?

Companies don’t need to make infinite money. That’s just a weird incentive that modern corporations seem to be chasing and burning everything down around them to achieve.