It isn't complicated if you have a physics background. I gave the definition. You dismiss it because it doesn't fit your narrative that strength doesn't matter. It does.
In fact, I could easily tweak the algorithm of any power meter on a bike to provide real time pedal 'force' instead of wattage...a simple equation based upon cadence. Why could I do this? Because Power is a function of strength. Not solely strength, but part of the equation.

Power = Torque X RPM
Torque = F X D
Power = F X D X RPM

Power is a function of pedal force which is function of strength. A 12 y.o. girl even world class can not impart the pedal force of competitive track sprinter. The girl is weaker. The girl isn't as strong. Say it any way you like, physics don't lie. Strength matters when it comes to propelling a bike. Not overarching even. Contador may not be the strongest guy in a room of men. Yes, he has superior aerobic fitness. But he has very strong 'cycling specific' muscles. Even before cardio comes into play he can create more watts on the bike than just about any weight lifters in the gym 'his body weight'. He is stronger relative to the muscles used to propel a bicycle.