The 15% pick rate drop when operators toggle between systems.
The economics are straightforward. If you are managing a facility where operators run goods-to-person at one station and a VLM bay forty meters away, the friction is real. They cross the floor. They log into a different interface. They reset to a different pick logic. The toggle costs five to seven seconds per cycle. Multiply that across a shift.
The fix is not always more software. The unified-UI work happening at the OEM layer is genuine progress, but it is not enough on its own. The actual lever is workflow design at the layout layer: cluster the bays so operators do not toggle, or partition operators so each works one system per shift.
A converged interface fixes the screen problem. But it assumes a harder problem already solved: the physical integration of two material flows into one ergonomic envelope. Conveyor heights, tote sizes, barcode orientation, reject routing. None of it changes automatically when the software does.
This is where installation discipline matters more than the application layer. The screen is just a screen. It is a 3D intersection of mechanical systems, operator reach zones, and lighting/audio cadence. The next bottleneck in multi-platform fulfilment is not the picking algorithm. It is the 3 m x 3 m zone where everything meets. Field perspective: when integrators bring us in to recover a stalled multi-station programme, the recovery work is almost always in that 3 by 3 zone, not at the screen layer.