lance is a core feature, which makes a campaign for this mod feels different from other mods. It is also better if you like historical base features (immersion) and RPG.
if all you want is another Native-like game with different skins (same thingy, with different swords/armors textures), then you can skip it. If you are looking for a new experience, lance system for sure.
remember that mercenaries are cheaper until you have your own centers (villages, etc), and harder to hire after.