The key point of the design philosophy "Less bBut bBetter", advocated by the legendary German designer Dieter Rams, is to eradicate the unnecessary elements of the form. The key point of the design philosophy "Less But Better", advocated by the legendary German designer Dieter Rams, is to eradicate the unnecessary elements of the form.

It turns out that the residueduced design is better than it's original form. It turns out that the reduced design is better than it's original form.

I wouldn't use residue, as that usually has a negative connotation, and refers to something that remains despite trying to get rid of it. You could also say "It turns out that the remaining elements form a better design than the original."