Ævar Arnfjörð Bjarmason [off-list ref] writes:
It's not so much about supporting scripting as exporting the
capabilities of the porcelain to the frontend utilities without
artificial limitations.
As a Porcelain, "git commit" has some leeway to enforce sensible policy on
the users, and "forbid commit that does not explain anything" is one such
policy. It is not generally a good idea to expose the full capabilities
of plumbing to Porcelain if it leads to bad user behaviour, and such
"artificial" limitations are safety features we do not want to remove.