Your trees may not be actually touching the wires, at this time, but they could be close enough to sway into the lines in high winds. The electric line is bare mental, high voltage wire, which can cause burning and eventually degrade the quality of the wire.
Also all the trees on this feeder should be on the same approximate maintenance schedule. This improves reliability to everyone on the circuit and reduces the number of trips we have to make to maintain that reliability. The amount of time that it takes to restore power is also reduced. Pruning limbs before they cause a problem is ideal. By doing so, we can direct the growth away from the lines.