I am talking about electrical grounds - the bridge is just another earthing point. It does not provide a return path to a different earth potential.
The only path to electrical ground *should* be via the output jack ground.
If you have a path to a different electrical ground via the bridge and by extension the strings I don't want to be standing in that spot holding that guitar - who knows what stray voltage you might experience...
I would expect that it is important to make sure the bridge is grounded (I haven't really thought about this) is that the string are probably a pretty good antenna, and may have voltage (and therefore noise) induced into them - grounding them will overcome this.
I am more than happy to be corrected on any of this. I have experience in electronics/radio/electrical but not a lot of experience of guitar electrics per se. (I've plugged plenty of 'em in, and repaired a few that had electricals come to grief, but I've never looked at the electrics in detail...







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