Chatussaagara Paryantam Chaturvaryaah Shubham Bhavatu
People of all four professional categories (Brahmins, Kshatriyas, Vaishyas and Shudras) should be kept happy. They should be taken care of. They are essential for society. This has to be told and said every day so that people remember it always in the actions.
Brahmins provide ideas for products and processes.
Kshatriyas maintain law and order and impose penalties when laws are breached.
Vaishyas maintain capital or wealth and create business plans for fresh wealth creation.
Shudras work in the ventures created by Vaishyas.
Varna system is a professional categorization. What about their intermingling? Any rules regarding intermingling are local. They are not universal. But the customs and rituals of these categories are different. Kshatriya has to train his body for fights every day. Others may not do it. Brahmin spends lot of time reading and experimenting. A vaishya may be wandering and looking for opportunities for fresh business or wealth creation opportunities. Their day to day routines are different.