That's still surgery, just minimally invasive.
More so than going in from the side (through the ribs under the right arm) and it would speed up recovery time.
I'm sure it would be limited to only "simple" cases where minimal complications (if any) are expected.
Certainly couldn't do me like that, the plumbings all wrong and they might end up cutting out the wrong valve by mistake!!!!
Sorry, inside joke that probably only CHD "kids" would get... =)