Currently, rain droplets are not dense enough on the aircraft windshields, especially on airliners. Wipers are also completely useless as they do not have any affect on the water droplets.
I hope this is changed to make flying in rainy weather more realistic. Rain drops should not only streak up or down the windshield depending on speed, but also pool together, blurring vision. Wipers should effectively clear visibility momentarily.
I know this will be taxing on the hardware, so having it be an optional feature would be best.
Examples:
