Why do I need RS payload for Server Components

[salos1982]

I created a new next-app project from scratch, build it and found that all static data in html are duplicated. First time is is used in html code and the second time it is used in RSC payload. I do not understand why I need to pass the same data twice. I hoped that using server side rendering helps me reducing this duplicating data.
But I think I will get the same code size as I had in next13 with only clients components.

If RSC paylod is required only for Streaming it will be nice to have an option to switch off streaming support and reduce file size of generated html.