How does RC actually work?

“as much diffuse light as you can get to eliminate shadows. Applies to indoors too where you can have absolute control over the light” - as I thought - but then I read this interesting alternative view

Aleksandr Gorky in https://support.capturingreality.com/hc/en-us/community/posts/360002794972-Flash-for-building-interiors-for-RC says:

“If you use mobile light you will get texture mixed from different pictures and shadowed parts on one picture will mixed with illuminated part from another picture. Finally you will get uniformly illuminated texture.”

“You must capture in RAW and then correct shadows in Lightroom\Capture One”

Any opinions?