What is the role of the most complex way of packaging DNA in the chromosome?

Everything is very simple. DNA is information about the body. You can draw an analogy with the information that is transmitted in a computer. And that and that information is packed in the most complicated way. This is to protect your data. The chromosome serves as a good carrier of genetic information and is not subject to random changes. When transferring information, DNA packaging does not allow the loss of some of its elements. The same applies to computer data in transit. Some bacteria have free DNA. Due to the simplicity of the cage and ease of transfer, more complex packaging is not required.