More complicated than that.
Some can be initialized by the standard HD44780 sequence or their own initialization sequence.
JHD1602 is one such example.
It won't fetch me a beer if I hook up four more wires?
For reasons that you and I have expressed before ...
I've been using the 4 bit configuration to connect my LCD, and it has performed as expected.What could I do if I connect it in 8 bit configuration that I can't do now? What would the other 4 pins get me?