We don't know what this power gap is. In fact, there may be no power gap at all. In order to determine if there is any power gap, we would need to know the peak power output of each motor, and I don't think that information is public at this point. Also, mid-drive motors are more energy-efficient than hub motors, so the 350W (continuous) Brose motor might actually put out more torque at the wheels than a hub motor.Vado Expert: 350 W Motor, 504 Wh Battery
Turbo S-CE: 500W Motor, 691 Wh Battery
500 € price difference. If they stop the Turbo-S-Version there's no model to compete with the competitors (Stromer).
I think the power-gap between those two will justify the Turbo-S in the product-line.