For the Post-Roman or Dark Age period, wargaming lists seem often an attempt to create differentiation between factions that probably didn't exist.
Take the idea used now in some army lists that the early Saxons in post-Roman Britan had a more fluid, dynamic form of combat than prior to that period or after that period (shieldwall etc). That idea seems to stems from the evidence that they used very small round shields (35-45cm). When you actually read the papers, you find that idea doesn't hold up (the sizes were minimums based on bosses). Nonetheless, any bit of differentiation is often welcomed in army lists. The Romano-British had shieldwalls but those early Saxons rushed around like loons with small bucklers throwing angons! Rather unlikely I suspect.