I was OK with the section because includes "at scale", "consumer devices" and it ends with "Figure out a way to cast your metal parts." The advice is not wrong,

I was OK with the section because includes "at scale", "consumer devices" and it ends with "Figure out a way to cast your metal parts." The advice is not wrong, just not complete. It would be better if it said "Machining might not be the best process, figure out the best way to make your parts -cast metal parts, use plate, sheet metal or simple extrusions, change metal for reinforced plastic, etc."