The Siren's Call of Custom Modularization

I've been thinking about Scott Yu-Jan's 3d printed drawer organizer and thinking about how it's too customized and it doesn't have any tolerance for if he adds, replaces or removes something from his tools.

I think Gridfinity is a much more interesting system since it's already modular.

The goal of this post would be to write about the principles that make the custom organizer a less flexible system.