Framework 16: Additional hardware questions

I'm looking to buy a Framework 16 in its most powerful Ryzen config. I'm looking at this being the last laptop I need to buy because of its modular design, so I don't mind the heavy initial investment.

I'm looking to shave of $400-500 by buying parts externally, however. I wanted it to be 64GB RAM, with a 4TB OS drive to run Aurora on, and later on a second drive for another non-immutable LTS distro (probably Debian?).

If I can source the same RAM/Storage, is there any reason to actually buy them from Framework? I'm a bit confused by the huge price difference, since I can get the same memory and storage hardware from Microcenter for about $400 less total.

And if anybody has any experience with the Framework 16 as a daily driver, I'd be interested to hear any stories. I'm not getting the graphics module yet, but may down the road to see if it can replace my desktop fully. Drivers should not be an issue as Aurora has a Framework image that contains everything I'll need.