My approach to introducing non-natives is similarly motivated. Especially if there's a trophic level that's conspicuously bare of edibles, or of other actors in the companion planting guild (nitrogen-fixing bacteria hosts, dynamic accumulators, et cetera...) I want to add to that, to provide what is lacking, and to fill the empty space with something productive, either for me or the
land. Of
course, I like to choose from as close to where I am as possible, hoping that the introductions won't be too foreign to the biosphere so as to not appeal to native wildlife and bacteria, but that might also be a useful trait, if the native version of a crop is too heavily preyed-upon by the wildlife, but the analogue too exotic to be recognisable to the pests.
We need this kind of tool, especially now. The kind of difference it could make in some places trying to stave off desertification and prolonged drought and famine cannot be overstated.
-CK
A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
-Robert A. Heinlein