mrm, I got the point but I don't think it has any validity from an engineering viewpoint.
You say the extra hose will help bleed the air quickly, but you only have to bleed air after the fluid has been changed, and then only a small amount if someone hasn't purged the system properly. As the fluid heats up, the air should purge very quickly through the one standard hose. Then for the next several years, that second hose is useless because there's no more air needing purging.
Maybe cars in the EU are switching to this. Mine still has just one hose, and "older cheaper simpler" has always kept it purged and working just fine.
A friend of mine has a "new, improved, highly engineered by the brightest minds" BMW. BMW relocated the battery
to the trunk, and left an empty battery box
under the hood
. And added a vent hose, to vent battery
acid under the car, instead of using a sealed battery, as Mazda did. Better performance and weight balance than the old batteyr under the hood? Perhaps. But WAY more complicated, for very little payback. And they made accessing the spare tire into a royal circus as well.
Sometimes, really, the engineers just need to be restrained.