I think the repel effect is supposed to simulate how spears can be used to keep enemies from getting because of the spears reach. Without the repel, it’s not a worthwhile ability to use and would just be a weaker riposte. You’d then only equip the occasional low-level merc with spears for the accuracy bonus.
Looking forward to the pike. It’s such a logical weapon to have. I think it was mentioned somewhere that you were consdiering it as a replacement for the billhook, because the billhook was more of a weapon meant for cavalry.