is there any reason to use custom release scripts like github.com/AndroidHardeni over official build tools like "m dist" for recent devices like blueline/crosshatch ?
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It doesn't do anything close to the same thing. The release.sh script has nothing to do with building. It directly uses the official tools for generating signed releases to generate a release. Most of what the `make dist` target does is a complete waste of time.
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The subset of `make dist` required for making a release is `make target-files-package`. It's a waste of time to generate a test key signed update package. The otatools.zip is only useful if you want to package up and move the tools used to generate a release (why?).
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The `make dist` target does NOT generate a signed, production release. It does a lot of useless stuff like packaging up the signing tools from the source tree and output and generating a strictly GPL compliance related userspace source tarball without anything non-mandatory.
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The release.sh script is a thin wrapper around official tools for generating releases. It takes the test key signed target-files-package built by make and turns it into a signed release by replacing all apk signatures, verity trees, image signatures, OTA keys, etc.
For development, `make -j36` works well. For releases, `make -j36 target-files-package brillo_upload_payload` is the target. The target-files-package is the input format used by the post-build tools for generating releases. Generating signed releases isn't part of building.
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Generating a signed target-files-package from the freshly built target-files-package is a post-build step. The signed target-files-package gets transformed into an image zip and a signed update package. The image zip and firmware are transformed into a factory images release.
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