What are the signs of the primitiveness of prokaryotes in comparison with eukaryotes?

Prokaryotes were the first to appear on our planet. In the course of evolution, eukaryotes were formed from prokaryotes. The differences in them are in the structure of the cell. Inside each cell, there are some structures (organelles) that perform specific functions. In prokaryotes, all these structures do not have membranes. They do not have a nucleus, plastids, vacuoles, and so on. They only have ribosomes. All these organelles appeared in eukaryotes. This is the primitiveness of the prokaryotic organism. But they still did not disappear in the course of evolution, since they have some adaptations to the environment.