"inductance" is an inductor thing. DC motors and solenoids have "inductance" which will create transient EMF with a fluctuating source voltage or current and back-EMF when powered off. Hence the use of a flywheel diode.
DC circuits are not "steady state" 100% of the time. They have to be powered on and off. A low pass LR filter is a common in-rush suppressor on DC capacitive circuits and circuits designed to be hot swapped. It wouldn't work without "inductance".
Regardless, my suggestion of a series diode was to protect from any unknown reaction of powering a large motor
But thanks for the lecture