Engineers are creative creatures who like to solve problems and build things. When you build something it becomes a part of you, no wonder that IKEA desk that took you 2 hours to assemble in an apartment has a lot of sentimental value than the Haverty desk you paid 3 times the price and just shipped it to home. Gardeners are also like that and the blackberries I grow in my backyard have a lot of sentimental value than the sweet ones I can buy from the store even though the home grown are sour 50% or more times . Given a problem there can be many designs to solve it and sometimes we pick one design and worked tirelessly for days to add few new classes and a shining new framework and then send it for code review and someone outsider with a devil's advocate view comes up with a new simple design to solve the same problem or sometimes unconsciously you would come up with another simple solution to the same problem but you hold back and you keep investing time trying to make the