I think at Nintendo they've probably worked on like 20 games over the years, which probably helps keep things fresh and interesting. If they were in the Super Mario codebase for 40 years, just adding features like 2FA and CSV Export using an "Agile" workflow, that would make it rougher for sure.
Also completely swapping out the technology multiple times over as many years, so you're re-implementing 2FA or other features multiple times, without anything particularly new or different about it, just different tech.
