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For what it's worth, film also suffers from reciprocity failure (nonlinear response at extended exposure times with low flux).

Some things were never easy.

Reciprocity failure doesn't stop you doing long exposures. It actually helps, if your goal is to make the exposure as long as possible. See e.g. http://itchyi.squarespace.com/thelatest/2010/7/20/the-longes...

Digital sensors obey the reciprocity law to a much greater extent than film: https://photo.stackexchange.com/questions/37241/does-recipro.... The problems the OP mentions are not related to reciprocity failure.