I used to have the same opinion, but I think for Linux it actually makes sense. A large, automated test suite places a lot of extra burden on contributors and

I used to have the same opinion, but I think for Linux it actually makes sense. A large, automated test suite places a lot of extra burden on contributors and maintainers. You will be expected to run tests, fix old tests, investigate flaky tests, and write new ones that cover your bug fix or new feature. The kernel instead pushes the responsibility for writing test suites and validating new releases onto first Line consumers like Red Hat, IBM, Google etc all. This is probably the only viable way to make it work. Maintainer resources are stretched thin as it is.