Yes, I have read about it many times - with the "keyless" cars or with the keys emitting a radio signal pretty much permanently these cars are defenceless if the owner leaves a key somewhere where it can be spotted by receving-transmitting device. Old habit of hanging the car keys on the hook in the hall must be changed... and indeed mechanical locks take longer to crack.
A friend of mine used to drive one of the "keyless go cars" (an Audi). She forgot the key (or rather card) from home. She got in, drove away and got to the office 15km away, no problem. She realized she forgot the key-card when she wanted to go from office home in the evening. The key-card was on the kitchen table that happened to be close to the car standing outside. Anybody anytime could have taken the car from the driveway.