Your best result may be temporary

Most founders see "improved gross margin by 30 points through BOM optimization" and think they are looking at expertise. Usually they are looking at evidence of how broken things were before.

BOM is one cost lever inside gross margin, sitting next to yield loss, scrap, freight, test time, warranty, packaging, and channel mix. When someone credits BOM alone for a 20-40 point margin swing, they are either compressing multiple cost fixes into one label or revealing that nobody managed the original BOM at all.

Here is a sane consumer electronics example.

Product sells for $100 net. BOM is $25. Solid BOM work, second-sourcing, spec tightening, volume leverage, saves 10-15% of BOM cost. That is $2.50 to $3.75. Gross margin moves roughly 2.5 to 3.75 points if nothing else changes.

That is what disciplined BOM cleanup looks like when the starting point was not a disaster.

So when someone posts about recovering 20-40 gross-margin points "from BOM work," one of these is usually true:

• The original BOM was never benchmarked, never second-sourced, and nobody challenged component selection at design phase
• The "BOM optimization" also included yield, freight, packaging, test time, or supplier renegotiation, but everything got credited to one line
• The work was actually a full redesign and cost-down program, which can be genuinely impressive, but calling it "BOM optimization" understates what was done and misleads anyone listening

The first is broken discipline. The second is bad attribution. The third is scope misrepresentation.

A product with real costing discipline from day one does not typically leave 30 margin points buried in the BOM. Second-sourcing was planned at design phase. Supplier pricing was benchmarked before the first PO. Every component was justified against cost, availability, and lifecycle before tooling started.

Nobody posts about that. "I built it right the first time" does not get engagement. Heroic turnaround stories do.

But if you are evaluating an operator or a consultant by how many margin points they "recovered," you are rewarding whoever walked into the biggest disaster. Not whoever prevented one.

Big margin recoveries are not proof of great operations. They are a receipt for broken discipline upstream.