Materials and repairability
What things are made of, and what happens at the end.
Chassis and shells
Magnesium alloy cores where stiffness matters, polycarbonate shells elsewhere. Both are chosen partly because they survive a drop onto a bathroom floor, which is the real-world load case nobody tests for.
Cutting surfaces
Carbon steel, ground rather than stamped, sold as matched sets because foils and cutters wear into each other.
End of life
A take-back programme for worn blade sets and dead batteries is in preparation. It is not live yet, and we would rather say that than imply otherwise.