I agree with all that.
I suppose that makes chemical sense, but I think that keeping the vinegar away from where it shouldn't be (and where it could do more harm than good) could be a serious challenge. Some of the 'de-rusting gels' might be a better bet, since they are at least not 'liquid'.
Great spot JJ!
Yes, I think that's common, but attempting to clean anything other than the very end of the conical springs (as commonly used for the -ve end of the battery) can be a distinct challenge, particularly if its at the end of a narrow dark hole!
I've often been tempted to try that, but have always been put off my the practicalities. As I've just written, the springs are quite often at the end of a long, dark, narrow hole and, even when they're not, they are often welded on (or riveted in an inaccessible place) and/or are of a bespoke design.
If it started life with some sort of coating/plating (and maybe even if it didn't), that's probably true, but by the time it's rusted, any such protection will be long-gone, anyway.
Fair enough, but that's just a fairly gentle form of 'abrasion', isn't it? Mind you, given how much scraping/sanding/grinding/whatever that is often needed, I suspect that a toothbrush would often be far too 'gentle' to achieve very much!
The bath with the corroded battery compartment.
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