It's a shame really, plastic surgery could have a lot of fun features, changing the face, breast size etc. And what about moodlets (sims being happy about their new image), random chances (1% chance something botches up, like a very long nose, too big breasts, your sim ending up bald maybe, 10% for sims with bad luck?) and a timer of 7 or 14 days until you can have another change. Elder sims could even be cosmetically helped to appear like their adult version (while still acting like and being elders) while the sum in credits quickly adds up with every change. It is a real shame.