Probably unacceptable as many would have built tooling around the specific default behaviors.

If tooling is relying on the output format of porcelain commands, it's wrong. The output of various subcommands have already changed more than once.

Jaxan 2 hours ago | parent | prev [-]

You can have your own version. You don’t have to push all improvements upstream.

	▲	swiftcoder an hour ago \| parent [-]
		It's not really feasible to maintain private forks of every piece of software you use (especially something like git that needs regular security patches)