At Ad Decimum, the Vandal cavalry performs well, but are let down by their commander.
Fair point.
But my concern is that the combination of rules and troop classifications as they exist at the moment don't re-create those Byzantine-Vandal battles as we understand them.
In particular, with an Inert general leading Irr Kn (F) if the generals get few or no PIPs then the Irr Kn (F) simply go charging towards the enemy.
What I'm reading of the battles against Belisarius is that when the generals (in particular Gelimer) failed to actively lead their cavalry, what the cavalry did was to stand around scratching their backsides, rather than charging wildly at the enemy.
In other words, if we want to re-create the behaviour of the African Vandal army when led by Gelimer, then either the rules for the behaviour of impetuous troops led by inert generals need to change, or the classification of those troops needs to change.
I'm open to either change - as I've pointed out in another thread the inert classification might be usefully replaced by two classifications: one for generals who make normally non-impetuous troops impetuous, and one for generals who make normally impetuous troops non-impetuous. And Gelimer could easily be placed in that second category while still leaving the Vandal cavalry as Irr Kn (F). Alternatively, it might be argued that massed Irr Kn (I) led by an inert general is still a scary fight for an Early Byzantine army as the Kn have a quick kill against all the Cv and Bd in the army.