I believe it's because to complete the Great Palace, which is indicated to solve or at least mitigate the crisis via improving bureaucracy and administration, requires 5 - 7 economy and art to complete depending on the amount of turns it takes. We don't yet have that amount available, and art is going down this turn, so balanced policy is believed best as it can acquire both of them before we transition to starting a Great Palace.This turn, yes. We are currently at the mid-turn. Next update is next turn, when they will have more actions. Hence why it will last a half-turn instead of an admin roll to see if it happens at all.
Why swap to balanced? We'll be continuously taking stability hit for several more turns most likely (we'll want to ramp up our econ vampirism as much as possible to help win the wars) and as long as we have at least 2 stability lacking, The Law will still apply. (If we only lack 1, they might not go for Proclaim Glory.)
This is good as we can potentially one turn a Grand Palace if we're not required to take any war actions that turn; as we can double main it using our own actions, use the secondary from that to change policy to mega project support, which contributes a further 3 main actions. This of itself could complete the Palace if it only requires 5 actions; but combined with that there could be a symphony bonus giving another action due to the synergy of collective action, along with kicking to produce another main action.