(2) The firearm is carried by the person directly to or from any
motor vehicle for any lawful purpose and, while carrying the firearm,
the firearm is contained within a locked container.
"directly to/from a vehicle" still doesn't come that close to open ended. In a lot of cases it would be useful... But if you were stopped, say, bowling, it would be difficult to argue that you were going directly to or from a vehicle.
I'd like as much as anyone else to be able to say I left a vehicle hours ago and my destination is back to a vehicle, with all of the other tasks in the day being a direct path, but I fear that a prosecutor would not see things that way.
By contrast, if one had a hidden rifle, one would not have to worry about whether they are on a route to or from a vehicle and could be on a route to or from no where or not moving at all and still be legal so long as they were not in a place specifically prohibiting guns by statute.
I've heard some respond something like, "Bowling is a lawful purpose." But the act of carrying a gun concealed in a locked case while bowling is not legal under normal circumstances, (whereby no vehicle is involved), and thus is not ordinarily a lawful purpose, I would bet a prosecutor would say. Now, if one had the lawful purpose of transporting the gun to an area where loaded open carry was legal, that seems to be bullet proof that one could carry concealed in a locked container on the way to an area where loaded open carry was legal, as loaded open carry is a lawful purpose in areas where it is permissible.