I am on the complete opposite side of this. Quests that lock access to crops to only those that do the quests are a deal breaker for me.
My work schedule is why I quit quests. I cannot do them. The stress of trying to do it all and leaving no time to myself or my family was what killed it.
I will NOT do these quests even though I master all crops. If I am prevented from accessing these crops, I no longer have any reason to play FarmVille. Period.