Parables in the scriptures are not the same as parables elsewhere.
Parables elsewhere may have multiple meanings too--even a hidden meaning, or not. But in the scriptures parables have their own structure not at all common elsewhere. In no other literature are there parables that include a greater spiritual word from God, not obvious at face value. In fact, in parables in scripture the object of comparison, is never the greater subject. So, yes, the lesser moral saying and comparison may have a simple meaning and benefit--but that is not why they are a part of the eternal word of God. The moral, worldly part ends when the world ends, but the greater spiritual part which is not always obvious, is true and relative forever.
Jesus gave the answer to why God speaks in parables, saying, "To you it has been given to know the mystery of the kingdom of God; but to those who are outside, all things come in parables" (Mark 4:11). In other words, the scriptures--the word of God--is protected and limited to those who are God's. Paul then elaborates, saying, "the natural man does not receive the things of the Spirit of God, for they are foolishness to him; nor can he know them, because they are spiritually discerned" (1 Corinthians 2:14).
But the reason I have posted this thread...is that even here, there are many who endlessly debate the simple, moral words of parables as if that is the greater spiritual message, which they are not. The scriptures themselves tell us that. Which, sadly, shows a lack of understanding the word of God--which is spirit.
Jesus gave examples of how the meaning of parables is to be stated--which He did by translating. An example would be The Parable of the Sower, where the object is "seed", but then He explained or translated the meaning saying, "The seed is the word of God." That one seems simple--even foolish to talk about. But there is a thread currently being debated about The Unjust Steward, where the debate continues to be about money, when money was simply the object of the parable, having nothing to do with the greater meaning. And every Christian needs to know that the object of God's parable language--is not the greater reason for it being written.
While we are at it--please, PLEASE notice in the Mark 4:11 passage above it says "all things come in parables." Meaning, everything available to the evils among the general public--"all" scripture comes "in parables"...therefore, having greater spiritual meaning.