That doesn't make it impossible to get such configuration options. If I can choose how much RAM I want, they could just as well offer the "no RAM" option so I can keep the two modules of my old laptop. Instead they lie to our faces claiming RAM has to be soldered on for some reason, making that impossible. Same with SSDs etc.
I would understand it if a manufacturer offered some ultra high-end model with custom storage like in the PS5. But if the Framework laptop can have swappable RAM and SSDs with almost the same thickness as a (insufficiently cooled) Macbook it's obvious why that stuff is soldered in.
Almost nobody wants that, but the good news is that enough people do that framework exists.