I'm not sure whether this is possible but if it was possible to specify a maximal expansion level one could get output that is more or less only about the relevant stages of the expansion instead of all sub-expansions going on inside.
Example:
\def\test{\pgfkeys{/a/b/.store in = \bla} bla}
\def\otherTest{\test}
\def\lastTest{\otherTest}
\unravel[max-expansion=2]{\lastTest}
Above example would then not expand \pgfkeys which would end in thousands of expansion steps when maybe one is only interested in how \lastTest expands to the level of \test.
I'm not sure whether this is possible but if it was possible to specify a maximal expansion level one could get output that is more or less only about the relevant stages of the expansion instead of all sub-expansions going on inside.
Example:
Above example would then not expand
\pgfkeyswhich would end in thousands of expansion steps when maybe one is only interested in how\lastTestexpands to the level of\test.