Jim Webster wrote:

....
Here are some differences that I could think in 5 minutes
the GM scenario would have a large number of crop varieties or even a
large
number of crops with several genes in common.

so what, all varieties of the same species have over 99% of the same genes
in common. They have to have virtually all of their genes in common or they
will not crossbreed which is a good rule of thumb definition of a species.
...

99.999999% similarity might mean the differencen between a disesase resistant
wheat and one that is a total failure.
I think you should go back and study your genetics and pland breeding.