No electronic component is ideal, not even wire.
There are properties like resistance, effective capacitance, impedance and reactance that would not intuitively be associated with a pure conductor, but neglecting little things like this can contribute to behavior that might raise its ugly head in unforseen ways if you are not aware.
What about back-emf in the antique world of vacuum tube audio working at hundreds of volts where you are driving what's known to be a very reactive but low-impedance load?
As the signal from the amp into the voice coil displaces the speaker cone from its resting position, the spring action of the cone surround works to return the cone to the non-energized point. Constantly, this has always happened.
But with tubes the impedance and voltage are so high that a major step-down audio output transformer was used to isolate the high voltage from the speakers as well as properly match the impedance.
No audio transformer is needed for solid state amplifiers since the transistors work at relatively safe voltages and impedance is not a big issue.
Either way as the speakers spring back, their voice coil moving on its own across the magnetic field, it generates a pulse of electricity from the speaker itself that appears at the output of the amplifier but did not actually come from the amp.
At high power and especially with square-wave type distortion often seen in musical instrument amps, this back-emf from the speakers can be stepped up to over 1000V on its reversed way back to the tubes through the "step-down" output transformer. When the tubes are only rated for a few hundred volts this is not ideal, and if the tube does not suffer internally, it can still cause a spark to jump between two adjacent pins on the tube socket. Once this happens both the tube and the socket can be ruined due to conductive carbon formation within the bakelite tube base and/or tube socket.
This may be an extreme example, but wires are not perfect conductors and circuit boards are even less perfect as insulators.