To be fair, speed compensated volume is not very pronounced in the Mach-E. There is only a small difference between OFF and HIGH at speed. Small, but it's there.
My theory is SCV was tuned with an exemplar Mach-E with laminated glass windows. If you do not have the laminated side windows or have wind noise, the SCV gain will not be enough to compensate for the wind noise. They need to increase SCV gain further for vehicles that end up more wind noise.