Modern theatre allows you to have an inward reflection more than the Globe does, but the Globe forces you to be more engaging. I do think the groundlings get the better share. I listened to Mark Rylance, who can speak really quietly and still be heard, and tried to do the same. He's just very clear. The clarity can be used in any theatre, but if you shouted and were unclear, you'd probably be heard but not understood in the Globe.
Clarity is the main point.
You can't get away with washing things away. It's like the TIE, because kids don't let you get away with anything either. Physically it teaches what it's like to be watched. It's going to be really hard going back to a theatre where you can't see the audience. Of course you also see them when they're inattentive or drunk.