Stick position is definitely relevant!!!
An aeroplane wing will always stall at the same Angle of Attack, regardless of airspeed or nose attitude - something you'll learn if you do an aerobatics endorsement
The stick position is our primary means of controlling the Angle of Attack of the wing in flight - move it back and forth and you'll change the AofA of the entire wing, move it sideways and you'll control the AofA differentially.
CofG and Power Setting also have an influence on our AofA because in most aircraft they change how effective the tailplane is (shorter/longer lever arm and more/less airflow over the wing).
Good book on the subject if you're interested is Stick and Rudder by Wolfgang Langewiesche. It was first printed in 1944, but not a lot has changed since then.