The convergence happens at the brief. Shippers specify volume bands, pallet configurations and SLA thresholds and every credible 3PL returns a proposal that clears those bars. The differentiation that actually matters for variable, demand-triggered fulfilment never surfaces because nobody asked for it.
Made-to-order models impose a different set of pressures on a 3PL than steady-state replenishment. Activation speed, tolerance for irregular call-off patterns and the ability to scale labour within a shift matter far more than average throughput. A provider optimised for consistent flow can look strong on paper and struggle badly when demand arrives in bursts.
The fix is not a longer brief. It is a structurally different one, built around the operating conditions that actually define the model. That means asking how a provider has handled sudden volume spikes with less than 48 hours of notice, what their minimum viable run looks like and where their labour model breaks under pressure.
The FLOX blog post on [3PL selection for made-to-order production](https://flox.is/blog/3pl-selection-made-to-order-on-demand-production) sets out why the standard brief systematically screens in the wrong candidates and what a more useful selection framework looks like.
