Moreover, one thing NIH syndrome handwavers miss is that developing a custom situation-specific solution allows you to expand your knowledge in that discipline, create a more tailored solution, and avoid supply chain vulnerabilities that can come with using third-party packages. In my experience a handbuilt solution to a problem is going to be much more efficient in most cases than OSS out there, except in spot instances where the scale of the task is not able to be achieved in a small amount of code (e.g. a versatile graphing library), although these are /very/ few and far between.
Moreover, one thing NIH syndrome handwavers miss is that developing a custom situation-specific solution allows you to expand your knowledge in that discipline, create a more tailored solution, and avoid supply chain vulnerabilities that can come with using third-party packages. In my experience a handbuilt solution to a problem is going to be much more efficient in most cases than OSS out there, except in spot instances where the scale of the task is not able to be achieved in a small amount of code (e.g. a versatile graphing library), although these are /very/ few and far between.