only a real actor who is X in real life should play a role about X

I personally don’t mind these kinds of aspects being or missing in an actor’s personality/characteristics.
If I don’t know what something looks like authentically, acting whatever while acting to be “it” seems good enough for me 😁 And if someone not being something acts authentically anyway, that’s good too!

Exterior resemblance has a bigger impact on me.
An example: It feels a bit weird how Disney’s new mermaid movie has a different-colored main actress compared to the animation. I know it’s important to bring all kinds of people to the mix but…I kinda got used to what Ariel originally looks like.