When very little was known about the structure of cells, there was very simple, in our opinion, evidence of the origin of a complex eukaryotic cell. As discoveries in the structure of the cell, scientists tried to explain the origin of organelles and the cell as a whole, thereby new hypotheses appeared. The worldview of scientists has changed towards the complication of our nature and cells in particular.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.