The homogametic sex matters because this is the default sex. You ever hear the lie that "we all start female"? Bullshit tranny-captured pseudo-science publishers like
ASAP Science push this, and you may have heard it as a kid in grade school. What these stupid lying retards should be telling people is that "we were all on the track to being female". For humans, the default developmental pathway is female. For chickens, it's the rooster. For humans, something (the Y chromosome) needs to come in and turn the individual male. Maleness, in humans, must be "turned on", like a trolley operator
refutes Kant and runs over an innocent man tied to the tracks pulls a lever and changes the pathway. If the trolley operator doesn't flip the switch, it's not like the train stops and waits, it just keeps going down the line it was fixed to, which, for humans, is the female.