As someone already put it, 'Bazel is the worst system except all the others'. It has some warts (Python integration, non-hermetic-by-default rules, starlark structure javaesque complexity ...), but I still haven't far a good replacement for my use: a monorepo build system that has to touch a ton of different languages and can be run in CI without having to prebuild tons of fragile builder images.

It absolutely is, especially if you do C++ with it. So many bugs and missing features in the native rules and skylark api, it's not even close to a 1.0