[otabdeveloper4]

Then you'll need config files for your config files, and we're back to square one.

The scope and capabilities of the config language needs to be limited, otherwise we lose the ergonomic benefits of configuration in the first place.

[blandflakes]

I sort of agree with this, except that I don't think it's square one. The ability to change config without rebuilding your artifact is one of the advantages of separate config files, and using an embedded language like lua wouldn't remove this advantage.