What this means for your play
Choices with practical meaning.
Materials, fuel, components and equipment have real quantities. Engineering gives you more ways to work within those limits. A solution can consume another resource, create waste, need a revised blueprint or take specialist time.
Build alternatives instead of free replacements
A shortage can lead to salvage, recycling, fabrication, conversion, substitution or a different resource chain. You might revise a blueprint or procure materials elsewhere. Each route has requirements and costs, so solving scarcity becomes meaningful play rather than asking the narrator to replenish a supply.
Keep an operation working
Equipment and facilities do not stay perfect forever. Maintenance and calibration have intervals, and delays elsewhere can push machinery beyond them. Servicing becomes part of readiness. What you have built gives you options, but it also becomes something you need to support.