What do you need real anchors for? Sharing of pipelines?
Maybe I’ve been burned too much by pipeline maintenance (because we didn’t have yaml anchors?) but I rather have builds defined in make /bazel/etc than in yaml. So the only thing the pipeline does is optionally restoring caches, kicking off the build system, uploading PR validation results, and saving cache. Pushing artifact etc is all done from inside the build system.
There is no “setup” like installing packages because we make the build image seperately.