"You are partially right. Modular flexibilty useful not only when you are assembling project, but also afterwards, when you want to upgrade it or modify for particular task at hand. Also, BeamCNC can drill just holes you need now via gcode file, you can do that if you want, but it will be harder to make additional holes afterwards. There quite a few methods to make furtiture. Strength of this method in flexibilty and modular structure. There is some cases where it will be beneficial, for example in makerspaces and workshops."