In Medieval Europe, untouchables often had side jobs like cleaning latrines and picking up dead animals that nobody else wanted to do. Contrary to popular belief, not everyone in Medieval Europe was rich, and they relied on experts' advice even in matters of torture directions.
The process leading to the decline of executioners can be described as a result of supply and demand. The smarter executioners had assistants ready to take their place, leading to less demand for their expertise and ultimately their decline.
The decreasing number of guillotine execution survivors indicates the fading acceptance towards capital punishment, and although it symbolizes a violent spectacle, it serves as a reminder in the context of discussing the societal issues surrounding it.