> that some species are 'invasive' and others are native is just picking a snapshot in time.

What's your point?

Invasive plants are still invasive. It's not always a problem but if they're getting labelled invasive it's usually because they're having a negative impact on the existing ecosystem or would if left unchecked.

Negative is relative to our human needs of the status quo I guess but again I don't really see that as an issue what other frame of reference would we be discussing?