They may require trained staff that aren't available to operate and maintain and repair them; they may not be able to withstand high temperatures and humidity; and they usually require a constant and reliable supply of electricity.
Suelen necesitar personal entrenado que no está disponible para usarlos, mantenerlos y repararlos; es probable que no puedan soportar altas temperaturas y humedad; y normalmente requieren un suministro de energía constante y fiable.