What would happen if each sensory receptor (e.g., ears, eyes, skin) were receptive to every type of incoming stimuli? If a human’s eyes were also sensitive to sound waves and odor molecules, could the brain distinguish and integrate this information?
Your brain would have a sensory overload. Your organ's sensory receptors and cells are specialized to send and receive that particular stimuli and send it to a particluar location in the brain. If all organs took in all stimuli, and the brain structure remained as it now is, it would have a harder time separating the information in the brain and you, as a person, would have a harder time understanding what stimuli was correct.
It is important to understand that the interpretation of data is not done by the sense organs. The sense organs are mere receptors who recieve stimuli, convert it to nerve impulse and the nerves transfer it to the brain. Now, according to above mentioned condition, if all sense organs were receptive to every kind of stimuli, it would not affect the interpretation as long as there are separate nerves for every kind of stimuli i.e. separate nerve for light, separate for odour,etc. These nerves should also go to the respective parts of the brain, where their impulses are to be analyzed. This is not possible looking at the current phase of evolution, where organisms develop specialised organs, instead of generalised organs.