This idea has been merged into another idea. To comment or vote on this idea, please visit AID-I-2024 dialogue tracking.
It seems like classic dialog (You say, "Hello world.") and playscript dialog (You: Hello world.) are both popular among different swathes of the playerbase.
In creative mode, it's pretty easy to just put "You:" in the "story" function, but in adventure and hardcore this isn't an option. That and, regardless of mode, it'd be nice to just be able to use the "say" function and have it work according to personal preference.