That’s essentially what adding decoupling capacitance to a circuit does. All of this is going to be limited by the fact that without extra switching logic the e

That’s essentially what adding decoupling capacitance to a circuit does. All of this is going to be limited by the fact that without extra switching logic the entire circuit wants to be the same voltage, once your fast source drains enough, circuit voltage will start dropping and the source will begin sinking current as things balance.