The carb heat control requires some input from the pilot - it is a carb heat assist rather than an outright control.
The carbon-based lifeform responsible for checking that the carb heat is correctly applied is usually the weakest link in the event chain.
Fuel injected engines from Lycoming (and Continental) became available around 1999/2000 as I recall. This probably explains why the original R44 was carburetted.
I quote Kurt Robinson (Frank's son):
"everytime there is an accident involving one of our aircraft we expect a lawsuit."
The net result:
Plaintiff remains injured/dead ... aircraft manufacturer has to increase prices due to liability suits ... lawyers get rich.
SB