Though those who do not have a maidservant or caretaker are harassed because their house is not in perfect condition, the fact is that maidservants and caretakers may spread infectious diseases to people in the house, The maidservants are often visiting multiple homes and can spread the harmful microbes. Additionally they may be also using public transport to reach the house where they work, increasing the risk of causing illness.
They also do not want to take leave if they are ill, because they may lose the salary for a day.
Senior citizens have lower immunity, so family members have to be careful before letting any servant in the house.