Questionable. Training against the overwhelming effect of a physiological phenomena at its absence.
The number of pure SGI crashes after a failed upset recovery is not overwhelming compared to the usual suspects of illegaly executed landings and CFITs.
You train for C at the expense of having to train less for B. More training has its upper limits too, you can only learn certain much and actively keep the skill on the line.
Besides the economical cap on training amount is coming down with more and more automation to claim its role in the upcoming aircraft design.