My Quests have been pretty random. I had a bad run when at the start but that run eventually broke. I've been able to complete most Quests.
I have a straighforward rule for Quests, that I will apply until such time as the promised FC rewards appear. If I have all the required facilities, I complete the Quest. If the Quest requires a Coin facility I don't have, I'll buy it - the reward will cover (most of) the cost of the facility. If the Quest requires a FarmCash facility I don't have, I'll ignore the Quest.
I'll reconsider this rule when the promised FC rewards appear. I expect the FC rewards will be paltry, but every green dollar helps.
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