3 years isn't all that long. There's still Fortran and Cobol in the wild from 40 years ago. Most people in silicon valley will have worked on a 20 or even 30 ye

3 years isn't all that long. There's still Fortran and Cobol in the wild from 40 years ago. Most people in silicon valley will have worked on a 20 or even 30 year old codebase at some point. And why do I need to upgrade Django? Did the fundamental principle of MVC change? No, the developers of Django just didn't like some Python 3.8 syntax and decided to rip it out and replace it with some shiny new thing in 3.9. They stopped backporting security fixes to the old Django version, the one with the totally-gross Python 3.8 syntax. So now, to use the latest Django version, you need to upgrade Python minor version also. Easily avoided if you rolled your own framework. (Of course, sometimes you don't have a choice, because maybe Python deprecated some perfectly-good syntax between 3.8 and 3.9 because the devs didn't like it anymore). Another thing is, that's every 3 years for Django. If you start stacking other 3rd party dependencies on top of Django (even something as simple as a MongoDB ORM), you'll have a separate, secondary upgrade schedule for that library.