Jeff King [off-list ref] writes:
The "[]" convention is a microformat used by Linux kernel folks. So it's
not "whoops, we are stripping stuff not added by git". It is respecting
a microformat used by the tool's authors.
That being said, if we were choosing a default from scratch today, it
might go the other way. But we aren't, and we have to deal with the
burden of breaking existing scripts by flipping it.
And I do think it no longer is sensible to expect that it still is
kernel-only convention. Any project that uses e-mail based workflow
with Git have known how "[]" microformat works, may even have taken
advantage of it to build their workflow around it, and flipping the
default will only hurt them.
A project that chooses not to follow the convention can easily tweak
a knob to keep using different conventions, so I do not see anything
to change here.