Unique IDs are a privacy concern. Best you can tell by randomized MAC addresses is who the manufacturer of the device is and the type of device if you’re lucky (like when the manufacturer’s departments are internally split into separate companies), but that’s not guaranteed.

Randomized MAC addresses: Bonjour

It’s a normal gate like those you have at entrances to stores.

I am sure they open automatically when the fire alarm rings. You can of course just go out through the normal cashier’s line.

If this country obsesses over one thing excessively, then it’s fire safety, so I have no concerns about that here.

The self checkout prints a receipt with a bar code on it and you have to scan it to leave the store.

I’ve recently experienced that magic box at a sports equipment store! I was amazed by how it just works.

In Europe it’s becoming popular to have scanners at the store entrance that you can take and scan your products as you go. Sometimes you can also do it with a phone app instead. Then, at the self-checkout, you just scan one code instead and pay right away. I love this system because it’s quicker and you get to avoid the anxiety of packing your bags too slowly.

What’s not on the picture: The BMW approaching in the rear-view mirror flashing the long beams.

Remember, no matter how fast you go on the Autobahn, there is always someone faster than you.