When using a power conditioner, why is it advised to run amps directly to the wall?

Simaudio recommended I plug my Moon amp directly into the wall. 

ChatGPT had a slightly different recommendation based upon the quality of your power. : 

Try both and trust your ears — but here’s the practical guidance:

• If your power is stable and clean: Plug the Moon 330A directly into the wall, preferably into a high-quality outlet (hospital-grade or audiophile-grade).
• If your power is noisy or voltage varies: Use the Furman P-2400 AR. It’s one of the few conditioners designed not to choke amps.