With the exception of "cryonic" superconductors, no electronic component has near zero series resistance.
However with comparators having gains of 106 or more, you can reduce the impedance by negative feedback gain, but still current limited by the series switch RdsOn.
All low voltage zener and LED diodes have similar Rs or ESR "bulk series resistance" that affects the knee, but remember this: The higher the current rating of the diode, the lower its ESR when saturated, or Rs or Rz or Zt as they call it for Zener diodes.
Rated max Pd = 1/ESR +/- xx % (Stewart's ESR Theorem)
It is exactly the same for 3 V LED diodes which you can use as. Zener diodes except you do not regulate by dumping the maximum load into the Zener diode; rather you regulate the series PWM with an inductor current and pulse and compare that voltage and current with a stable current into a low-power Zener diode, programmable Zener diode, or an LED voltage.
So in conclusion, the regulation of the voltage is due to the loop gain and fixed voltage reference (LDO or band gap or LED) and controlled series R or PWM regulated Buck current charger with a voltage limit.
In other words, think of it like a small lithium polymer battery SMPS battery charger with a different profile of Vmax and Imax. See? In fact a lithium polymer battery has more than 100k farads, but due to double electric charge layer has short term memory from 4.2 V to 3.7 to 3.6 V. Which I have explained in other questions.
An OVP crowbar must have a series fuse or polyfuse in case of series regulator failure!!
You would expect a TVS diode to have an extremely sharp knee (read low ESR). This one is rated at 0.07 ohm for ESR (see Rdyn). According to my formula the package maximum rating with a heat sink should be 14 watts at 85 °C (read ESR =1/Pd max rated continuous at 85 °C with a heat sink.
But then a TVS diode is not intended to use as a zener but in pulse mode , you could. They do not give a Pd rating, but if you see the size, you will see it is close with a large metal plane. Ppk = 800 W