The classic 'Mini' had it just about right: what isn't on there can't break or fall off.
I've done a few thousand on the e-bike now and it is only getting used more and more. Car trips are now anything in really bad weather, long distance or with more cargo than the bike can take.
They usually serve to allow for automatic roll-away protection. On new Jeep Latitudes they come on automatically when the vehicle senses you have the vehicle running and are stopped, with the door open, or neutral. Owners like the hand holding ... it's a Jeep thing.
It does increase the price a little bit and if you do not have an OBDII scan tool and need to buy one. If you operate the EPB maintenance mode very incorrectly it is possible to damage the EPB mechanism. They're pretty easy to operate and replace if you know what you're doing.
VW (and others such as some Jeep) uses an electronic parking brake which requires a scan tool to command the ECU to enter maintenance mode in order to retract the electronic motor on the rear axle to allow the piston to retract.
You can do this at home if you have a scan too. If you do not have a scan tool it is still possible to do it manually by disconnecting and removing the EPB servo and manually retracting, but it tricky and not recommended.
They use triple square fasteners on the bracket, and are typically a pain in the ass for this make.
Is there something else I'm missing?