For configuration you very much do not want Turing-complete language -- or
any programming language, for that matter. Configuration quite often is
processed by more than just the original program it was intended for, so plain
data dump is the easiest form from this angle. Also, it's much easier for
human operator to just read the values than to interpret a de facto script
that produces values.
There were several attempts at using a programming language the tool was
written in for storing its configuration. None worked well enough to catch up
as a general trend, and not because the languages used were Turing-complete.
My opinion is that a programmer has seen for a short moment what sysadmins do
and decided to make something to help in the task, without really
understanding what's needed and what works, what doesn't work, and why.
There were several attempts at using a programming language the tool was written in for storing its configuration. None worked well enough to catch up as a general trend, and not because the languages used were Turing-complete.
My opinion is that a programmer has seen for a short moment what sysadmins do and decided to make something to help in the task, without really understanding what's needed and what works, what doesn't work, and why.