I'm of the school 'Write what you know.' You can educate yourself, but the best writing usually comes from the heart.
Write plays that matter. Raise the stakes. Shout, yell, holler, but make yourself heard. It's time for playwrights to reclaim the theatre. We do that by speaking from the heart about the things that matter most to us. If a play isn't worth dying for, maybe it isn't worth writing.