For me, happiness with (my) code-quality on a given project is inversely-proportional to the length of a given project. The longer the project, the greater the probability that I will have learned new techniques or improved on existing techniques. Further, if a project is longer, I'm more likely to have reason to revisit earlier code — even if I'm not accorded the time to fix said code. Thus, the longer a project goes on, the more-glaring the poorer quality of the earlier code becomes.
A real exacerbator of the preceeding is that the longer a program goes on, the more the project demands, change:
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