That is exactly how it is supposed to work. An actor is assigned a part based on their ability, rather than who they are. In theory.
In practice, it's kind of become a circle-jerk, self-important cadre of people with more money than taste. Why else are we getting such a glut of unnecessary remakes and reboots, when they were done properly the first time?
And the point I was trying to make is that "what is in our pants" shouldnt matter. To casting directors, to potential employers, to anyone but a very select few of our social circle. (I could have expressed myself better, I apologize if my words got jumbled)
We're not asking for preferential treatment - at least, not collectively. There are some people out there - trans or otherwise - who want everything catered to them. But these are the exception, rather than the rule.
For the rest of us, we just want the same shot. So what if we miss? Then we can say we tried.