I don't think they realize how much time they actually spend together so a little separation is healthy. And it gives Rachel an excuse to shop. . .MAJ!
Of course, Rachel never stops working. If it's not filling us in on what's to come, it's endorsing Exude lipstick. I love when people give her lines to memorize because it's always hilarious. Obvi, I'm always there to say what the director would never say to her.