Quality and Time

Let me ask a question where time is a limiting factor, and I've seen this happen numerous times. What is higher quality? half finishing something 'high quality', within the time you have, completely finishing it, but to half the quality that you could have done with unlimited time, or not doing it at all, and continuing with what you would otherwise have been doing? I would argue high quality half finished is the worst of the three options. That is, doing nothing different is better than trying to do something high quality but failing. Of course you don't set out to fail, but not understanding the time it takes to do something can cause failure. Sometimes its important to decide what not to do. I say this even in the context of the popular articles at the moment, which use the phrase, ' The aggregation of marginal gains '. There are huge flaws with superficially following this logic. I read one article which takes the premise to mean that to be s