well, i was goign off the premise that all top tier footmen should be useful and there should be no clear outlier before anyone else (archers before footmen, skirmishers before pure melee) and that there shouldn't be a single footman that can do it all, because why have anything else? the idea of having a troop tree is to have variation and choice, to mix troops to best effect. otherwise me might skip this thign altogether and only have fians, khan's guards and whatever and laugh at people that want balance and diversity...
footmen by that time period were essentially grouped in to categories: line ('heavy') foot and light foot. line footmen were supposed to fight in formation and give a base to rally behind and protect from cavalry charges. skirmishers are part of the light infantry that can't wear heavy armor because it would slow them down/tire them faster and make them less agile. they were not supposed to withstand infantry or cavalry charges but retreat behidn actual line infantry.
in bannerlord, some heavy infantry classes get javelins for no reason other than makign them better or not letting that extra weapon slot going to waste i guess. likewise skirmishers get equipment with which they can compete with heavy infantry on equal footing.
which brings me back to my OP: some factions clearly have different branches of footmen that can be categorized as skirmishers and heavy infantry, however the progression doesn't always make sense, and the battanians get various types of footmen that are often both heavy foot yet also skirmishers but to varying degrees.
let's take sturgia: there are two main branches that can be classed as 'melee' and 'ranged'. do you want to get the best skrimisher? guess i gotta go into the 'ranged' tree and upgrade that javelin foot. wrong! the javelineer ultimately upgrades to mounted skirmisher. the best foot skirmisher meanwhile is in the melee branch...
empire? tough luck, no dedicated skirmisher, even though they were well known for it. they were however not really known for their crossbowmen. therefore it makes sense, IMO, to replace the crossbowmen line with skirmishers armed with tzikourion axes. that would also give the faction more flavor.
battania? as said, one muddled mess. there are two branches that can be liberally categorized as 'heavy' and 'light', but the equipment is all over the place and they have two nearly identical final heavy infantry/skirmisher upgrades, just in case someone made the wrong upgrade choice earlier i guess.
aserai? the. worst. first you branch off into two virtually identical infantrymen, only to find that you are ****ed either way, because the tier 3 upgrade javelineer turns into the archer eventually, and the best skirmisher is, as usual, the heavy foot with shield.
khuzaite darkhans used to have eastern javelins, but now they only get one triangular throwing spear, makign them eastern legionaries essentially...
in summary, yeah there aren't exactly dedicated skirmishers, which IMO is a big issue...