You guys must have not yet encountered the infirmities of old age yet.
I'm in my late 50s, and on my home table (33" height) I can still get low enough to see the CB-stick-OB trilogy as a unit. But on lower tables (I dread the 29") I can't get down far enough to see the CB and OB together on long shots, and eye/head movement comes into play. I can foresee the day when I won't be able to do his on any table.
So for that segment of the population that can't see the proper alignment when in a comfortable stance, I would contend that CB-last is a viable fix for some players.
I'm late 50's too, but I will admit that my stance is bit more upright than say a Buddy Hall chin on the shaft stance.
Maybe you're right -- later on, CB last might be the only way to go. Still better than the alternative

Lou Figueroa