The comparison of RL-CSP performance in SrY2O4 and Y2O3 with different fixed policies indicates that, while manually tuned fixed policies may be able to provide a performance advantage over RL-CSP for specific compositions, such as the Original policy for Y2O3, RL-CSP should be the default option when exploring a whole phase field because this necessitates performing CSP for a range of compositions, and RL tailors the policy dynamically to each composition, thus avoiding locked-in poor performance from a fixed policy, such as the Original policy for SrY2O4 or the Uniform policy for Y2O3.