The layout of the clefs and staves, and all the other elements of music notation, are the way that they are because they have evolved to be that way as a result of many centuries of usage and refinement by all the musicians in the world. They are the best way to represent the notes.

Also, the piano's sheet music is represented on the grand staff, which is a treble clef and staff together with a bass clef and staff connected by a bracket. The piano does not use the treble clef and staff alone.

At this stage I suspect that you are only beginning to study music. Initially these concepts may seem daunting or counter-intuitive, but that is only because you know very little at this point. The more you learn, the more sense it will make to you.