Shudra are the server, and please think it, one who work as a server definitely their mind is not set as this is me and that is you. a server never compare. never competitive, and you heard about jain guru that become a wood cutter after enlightenment because serving is all about. And one who are in this field they are definitely a enlighted people or will be enlightened soon because they do cleaning, providing, helping in every kind of work for everyone and this is only one can do if they do as a father or mother. So, in every stage of live you have your parent with you that always help in every work. How beautiful this varn system that categoriesed it. Enough after knowing these varn system science you didn’t not feel to spread it? Umm Well in our bharat this kind of society lives, all are educated in gurukul with all knowledge and when they were completed their basic learning then they go with their intensity or if they have not any they will go with their kul and who were go with their intensity they have also learn the basic things about their kul knowledge and this is how a complete course of a citizen take in a gurukul and thats why they were live well stable life. May this happens again after few years.