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While the shape of a guitar is efficient when being played, it makes it very awkward to find a way to simply put it down. You could lay it flat on the ground or lean it against your amp perhaps, but these are risky moves that will subject the guitar to forces that at the very least can ruin its performance and in a worst-case scenario, lead to major damage to your prized instrument.
Guitar stands and wall hangers are designed to hold your guitar securely while minimising any pressure on the instrument that may detrimentally affect its performance. They are also a great way to display your guitar and keep them within arms reach. If you are a musician that adores the look of their guitar, why not keep it on display?