As soon as you start giving people jobs because they are trans, or female, or Asian etc you are building expectations of special treatment. And, quite possibly, are not hiring the best person for the job/role.
Yes, and it will ultimately tend to work against those actors themselves, who could very easily find themselves unable to play roles they might be interested in but which do't fit their profile. If someone like Juliette Binoche can convincingly play a Hispanic role, presumably a Hispanic actress can convincingly play a Frenchwoman, and why shouldn't she? But if it becomes normal to think of these kinds of identifiers as being exclusive, people are deluding themselves if they think that sort of ideology won't equally apply to supposedly dominant groups of people. I can easily imagine a bunch of French people being upset over someone not French playing Joan of Arc or some other role with a lot of national meaning.
I am not convinced that is a road we want to go down.