I’ve tried a couple rolling distros (including Arch), and they always “broke” after ~6 months to a year. Both times because an update would mess up something with my proprietary GPU drivers, IIRC. Both times, I would just install a different distro, because it would’ve probably took me longer to figure out what the issue was and fix it. I’m currently just using Debian stable, lol.
I don’t understand the Scrum one. Scrum is also agile with short development cycles, and prioritizes communication with the product owners and stakeholders.
I’ve never heard of lean development, but not a fan of “lean manufacturing,” at least not the way it’s commonly implemented in the U.S. (using primarily temp workers so they can ramp up and down their workforce as needed; and it also exacerbates supply-chain problems).