When you reach 30's, 40's, 50's and after you've seen What Works and What Will Not Work happen over and over again, you just might find yourself turning into th

When you reach 30's, 40's, 50's and after you've seen What Works and What Will Not Work happen over and over again, you just might find yourself turning into that cranky old man too. Also, practices which are acceptable with a single coder or a small number, or on a non-mission critical piece of software may not be acceptable in the other kind of situations. A bit like how having no tests is The Right Thing for a one-off task shell script. Whereas not having any tests will be Dangerously Stupid for say rocket control software. When a developer goes from writing a little me-too CRUD web app to then wanting to commit something into the Linux kernel, somewhere in there you cross that kind of threshold.