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.

I think a lot of the technical challenge is in that few people try to grow tomatoes indoors. If you try to grow each indoors, or outdoors, the technical aspects are more similar.

I think it's great that you posted about your ideas about it, because there are huge opportunities related to everything about cannabis that most people will overlook due to the various issues from the past still surrounding it.