Constant power-switching

Hello!

I am enjoying my system using this preamp by Pro-Ject, Pre box s2
https://pro-jectusa.com/product/pre-box-s2-analog/
It is a very simple box, only weighs 400 g.

I have bought a 20000mah power-bank and plan to use it with the preamp.

But I have heard many times, that constant switching of power on hi-fi equipment is NO GOOD for the
device, since it STRESSES THE TRANSISTORS.
But using a powerbank, it will be running empty atleast every week, and I will be forced to disconnect
it, charge it, then reconnect it, over and over and over again.

I am afraid that this is a tough question, to which probably only long-time-experiments can give a good answer,
but I am annoyed by the perspective of misuse.

Perhaps the stressful power-switching is more harmful on the more powerful devices, such as power-amplifiers,
and integrated amplifiers? And not so much issue on the lightweight preamp?