Thanks for the post.
It is indeed a VERY good deal at $20.00
What aircraft could $20.00 buy you in P3D or XPlane?
The answer is simple, next to nothing.
The sounds that are with it are quite fine for an aircraft of this price range, and your post explains the difficulty and cost factor involved that allows this aircraft to be priced as such.
However, like the old saying, “beauty is in the eye of the beholder”, sound is quite subjective.
What one person thinks of as real, may not be by the next person.
The drawing card of a sim is that you can make your sim into your version of reality.
If the OP wants a sound set that they feel sounds nicer to them, it can be done easily, so all in all, that is a good thing.
They are now a lot happier with their purchase, and will soon realize that it is indeed a fun plane to fly and well worth the money.