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Not all kings were natural leaders, after all.
Not to mention that there's leadership and leadership. I've had a number of characters that were definitively leaders, but none of them have been better than middling good at marshaling. Every time Jenred took direct control of Arcaea's military, for instance, it led to a nasty defeat (Literally, every time. I kept track for a year or two, and beyond that, I can't recall a single instance where it worked out well).That said, I don't think anyone on the dev team is suggesting that there shouldn't be a way for Kings and the like to fight in formation with their armies, just that figuring out how to get that to work given the new estates/oaths system is non-trivial.