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personally, I don't see a limit exists. unless you've over exposed the shot to white, I like to chase the noise down with subs rather than processing and i rarely get a chance to reach my desired exposure in camera so getting those extra subs helps me boost signal in post, it also depends on what you are trying to achieve.
I sort of feel people are doing the same fad thing that happened when digital photography took off, in that people are going Filter Happy and overprocessing to exaggerate rather than produce a good and accurate photo. especially tone mapping (what the plebs wrongly call hdr)
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