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I'll play devil's advocate here and say they probably get away with it because it's branded as cosplay so the reality is still ours, it's just a girl dressing up.
Do I like it? No. If you're going to do it, really go for it.
But i'm guessing it's a way for them to be cheap.
"Computer...
I no longer wish to meet with the ambassador from Earth.
Cancel my meetings for the morning and assign all of my work to Spock.
I'll be in my quarters."
https://media.giphy.com/media/yNvlalDnIAATu/giphy.gif