Yeah I get it. There are a ton of modern cars that use a push button for the parking brake. And realistically with modern braking systems having an independent backup that you can modulate in case of a total failure is pretty much overkill.
I've honestly never had a complete brake failure that required something like that. Trying to use the factory A-body handle for a failure like that would only be slightly better than on-off anyway, although I have considered changing my car over to a tunnel mounted e-brake lever. Totally overkill, just one of those things I think about.
The electric system would definitely be easier to route on a car with weld to floor sub-frame connectors! Not to mention it would free up a lot of space under the dash.