[spraak]

I think that the technical challenges of growing cannabis vs. tomatoes is indeed different, but can be equally difficult or simple, related to the quality of the product you want. There are similar such inventions for growing tomatoes to what you mention for cannabis. Tomatoes too have a long history of breeding for size and other aspects as well, again similar to cannabis. You can grow "ditch weed" just as easily as poor quality tomatoes by not tending the plants etc.