I don't think that'd be useful, purging is done to preserve performance and functionality, even if we'd put a warning the user could not Cancel the operation because we think it's necessary. Just warning that "we're about to purge data" wouldn't help. Data has to go at a certain point and we cannot guarantee the product will work as expected if that doesn't happen. It's unfortunate the limit wasa bit low, new limits should be better.
Bug 1772746 Comment 1 Edit History
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I don't think that'd be useful, purging is done to preserve performance and functionality, even if we'd put a warning the user could not Cancel the operation because we think it's necessary. Just warning that "we're about to purge data" wouldn't help. Data has to go at a certain point and we cannot guarantee the product will work as expected if that doesn't happen. It's unfortunate the limit was a bit low, new limits should be better.