The downside of good theater is that once you are there you want to live there. And you can't. It is the same as the downside of good books, poems, preaching, music, painting.
Art at its best touches us at our best and then, at least for a little while, nothing less is enough.
Theater is not actual reality. Theater is the original alternate reality game. Still, theater is a good play in the actual reality game. Theater is a strategical play in the game. You don't get much reality for playing theater; you get illusion and you give illusion. You also get a direction, a suggestion for a goal to be reached by a series of tactical movements, and a sharing of vision which allows for cooperative play.
The illusion can be pleasant, but passing. The sharing may be more lasting. The reality constructed by cooperative play is the justification for the illusion.
In the end, if the play is good and the sharing is deep, you can begin to live there.