As a general principle I assume anything exotic isn't necessarily good. However none of my vegetables or fruit are native and they are certainly useful. And we keep them under control. There are a whole bunch of plants and some animals that I happily zap because they are not useful or needed.
Not a problem. There are two things generally it is nice to know. Actual species name is nice. Plus whether it is an Australian native or an import. Basically if it is an import and not terribly useful then as far as I am concerned it is on the hit list.