Linux development is hardly waterfall development. Take io_uring. It started with a very small subset of syscalls and they are now adding new ones at every rel

Linux development is hardly waterfall development. Take io_uring. It started with a very small subset of syscalls and they are now adding new ones at every release at every stage. Take bpf. It was meant for networking, and it is slowly transforming into a brain new kind of OS. Even before a feature lands in mainlinel, we're far from waterfall. Usually a developer will issue a RFC thread implementing a feature as quick and dirty, but as a basis to discuss, and to have people start to test and tinker with it to see what can be done with it.