https://www.allaboutcircuits.com/technical-articles/the-i2c-bus-hardware-implementation-details/
I read from this article that for the open drain there's nontrivial power consumption when the input is HIGH and the output is LOW. The current flows from power supply, through the resistor and through the nmos to GND.
How is this non trivial power consumption when compared to the push/pull configuration where the inputs are HIGH and Vout is connected to GND through an NMOS?