Why do farmers in the U.S. buy seed yearly if they could save some of the seed and replant it?
I have heard from a couple farmers that the seeds from the crop is slightly inferior to the originally planted seeds. When replanted their seeds are slightly more inferior. I do not know if that is actually true. I am trying an experiment with beans to see if it is true. I will know in a few years.
You can’t do that if the modified seed is deliberately sabotaged to prevent this.