Isn't it also a problem for breeders? I would think pollenation could cause issues for indoor as well as outdoor crops, especially specific strain breeding and understanding pollenation patterns would help mitigate some of that.
Periodically you need males and females doing their wonderful thing and mixing it all up from seed
What is the mechanism that prevents this?
But I think the DNA degrades over time
Mēh! What we do not understand about genetics matters more than what we do....
I am no botanist
However, if you’ve tried the “same” strain from multiple growers you’ve likely found that the smell can vary significantly, and (as a consumer) there’s really no way to know what the flower’s aroma (and appearance) will be without direct observation. This is aligned with your hypothesis.