Get into the play too deeply and grade the actors personally and the plot of a play.
As for why you say that?
First of all, this actor must have a good professional quality. Before filming, he must read the script and understand his personality, experience and so on. If he wants to live this role!
Moreover, if the plot of the play is too real, the real meaning means that it is very close to or similar to the actor's own reality, and the actor can easily substitute some of his performances, nervousness and inner activities, so it is easy to get into the play!
To put it simply: it is very common for actors to participate in acting, which is a professional habit. How can they perform well without taking part in the play? Just like you are a designer, if you go to other people's rooms, you will see the overall apartment type, design style and so on!
However, personally, I think it is very rare to get into the theater too deeply, because caring for each other, work and life are two different things, work is just to make money, and life is the purpose. Therefore, the actor's job is acting, and he has had enough at work. There is no need to care about work in life, work is boring!
So, personally, I don't think so. As for the online saying that Leslie Cheung played Farewell My Concubine too deeply, I like Leslie Cheung very much, but the online jokes are ridiculous. It was just a moment, so I can't live without it!