I disagree. Dozens of parts are needed simply to bring an electric wire into a door. Every penetration needs grommets and strain relief. A flexible weatherproof system needs to get the wire from the door to the rest of the car. Relays. Fuses. It all adds up. I cannot believe that a manually-actuated lever would require any more parts.
Then there are those who say "every wire complicates compliance testing, every automation complicates failure modes, every custom part complicates supply chain", and they are the ones that prefer in-house mechanical parts with conservative materials and tooling.
I think it's an age thing, maybe it's a hipster vs greasy-elbows-shop-floor guy thing, but honestly it can be hard to tell who's right.
Obviously I'm speaking generally and individuals vary greatly.
When things go wrong, i.e in a crash, you still want to guarantee an undammaged door latching mechanism can still be operated independent of other parts of the car being damaged (likely). To satisfy this for a purely electrically actuated latch you would need a battery and independent controller in every door.
It's hard to beat the reliability of a mechanical latch and a human hand to satisfy that requirement.
You mean the grommets and strain relief that are already present for windows/speakers/locks? In most cases it's probably not even additional wires as power and control (either can bus or lin bus) are already established from the door to bcm (body control module).
So using the electricity already present for the door handles has to be entirely tempting.