I havent encountered that issue in one-shots I've ran, but I do agree that it'd be static for long term play. Honestly, they should probably just steal the Beliefs/Instincts(/Goal) systems from Burning Wheel/Torchbearer with some flavor twists to make it their own. I don't really see a downside to just letting players write their own Ideals, will try this out in the next one shot I run or when the system comes out, whichever comes sooner