Same applies to most companies. Unless they are in an explosive growth phase, or in a catastrophic collapse phase, 3% change in expense / efficiency of the engineering organization is pretty noticeable.
I’m convinced it’s a percent or two of GDP!
That's not how percentages work! 7% would turn into ~6.8% if you shave 3% from it.
My idea was to show that changing some big value by a few percentage points of that big value, e.g. of the cost of running the engineering organization, may have a serious impact on the overall balance.
Engineering organizations are expensive to run, and their cost in a tech-oriented company may even be the dominant cost. Saving even a small percentage of that cost is pretty noticeable, compared to other expenses of the company.