A few of my cars have four-line brake systems with ABS and stability control.
Does the order in which the brakes are bled really matter? The lines appear to be entirely independent downstream of the brake controller in the engine bay.
(Yes, I've seen this thread and others, but none, as far as I can tell, address a four-line system.)
I could imagine this being important on a three-line system, but on any car where the computers can actuate all four of the brakes independently, I can't see how it would matter.