Ah, right I wasn't aware of that. Still, AFAICT Gradle isn't nearly as 'ambitious' in tackling the hard problem of hermetic/reproducible builds as e.g. Bazel, s

Ah, right I wasn't aware of that. Still, AFAICT Gradle isn't nearly as 'ambitious' in tackling the hard problem of hermetic/reproducible builds as e.g. Bazel, so who knows how reliable that build cache actually is. You may well be right about Mill, but it's probably too early to tell exactly where it'll land in the design space. (Btw, I think it's entirely right to be wary of yet-another-build-system, especially when it doesn't seem to do anything that other systems don't already do.)