e brakes are cheaper for the manufacturers. But they don't hold like the drum style.
I thought "electronic" just referred to the actuation, like instead of being cable actuated. But the method would be the same, whether caliper type, drum style or hybrid (caliper rear brake with drum e-brake). It's supposed to help with packaging, i.e. no large hand pull taking up up valuable real estate on the center console. Foot brake doesn't take up much space though so dunno 乁( •_• )ㄏ
Firstly, the units that are in the console are emergency brakes that one can actually use to slow the vehicle down. These are usually cables attached to the caliper and actually use the caliper pads to engage the rotor.
The foot pedal units are typical parking brakes. Cabled connected to drums inside the rear hub. You can also slow the vehicle down in an emergency but not with the same control as the hand unit.
"e brakes" as described above are purely parking brakes and double as the "brake hold" feature in many cars. Haven't tried, but I don't think the vehicles computer will allow an e brake to be set while the vehicle is moving. An e brake is integrated into the back of the caliper. Held in by tiny bolts not easily accessible. Once corroded good luck. You cannot change the pads without deactivating these motors. If the vehicle doesn'y have a owner/user access function to the vehicles computer you'll need a programmer. If that's not happening, then you need to dissemble if you're lucky and hope it all goes back together. During this process the vehicle is disabled.
No idea the cost of these motors, but it will be outrageous and will really scr*w used owners that all already struggling financially. It's not as dumb as stop/start, but close.