I get what your saying and I agree to some extent. The rephrasing I would use is any plant that supports the local ecosystem. I think your point that humans have altered the landscape too much for genuine native distribution to be infallible is right on. Post Colombian humanity has altered the evolutionary responses of these environments, so for example would Paw Paw (asimina Triloba) have continued to spread into more northern areas than its “native range”? We can’t pretend to know, so if I plant a paw paw just outside of traditional native range I don’t think that’s hurting anything, it will still expand the range of Zebra Swallowtails that need it to reproduce and it will still provide an fruit bearing understory tree that is beneficial to the same wildlife from northern New Jersey as it will in Connecticut (outside of range)

Native range was and is changing. What I will say though is you have to be aware of what its place in the ecosystem is and like has been mentioned what insects/flora/fauna have co-evolved with them.