Not every land may be the kind to feature a Knightly lord. Maybe there's a bigass magic academy or an elven fortress or a dwarven mountain clan...
The fact is, the idea of other lord types can lead to potentially new challenges for keepers.
Perhaps there's an Archmagi or the High Priest or Bishop. Maybe the Arch Druid, the Elven Queen/King or a Dwarven Warlord stands in our way. Their fighting styles would therefore vary greatly.