The Malaysia-Singapore land crossing is one of the busiest in the world, so any time saved crossing it is a plus.
"Calls for Malaysia to also implement QR code clearance at its land checkpoints with Singapore have grown louder in the wake of positive user feedback to Singapore’s rollout."
@Suiseiseki The QR code is used for clearing immigration, instead of showing a passport (or passports for a group of people).
The information collected is the same as if the travellers showed their physical passports at the border checkpoint, only faster, as the information has already been entered in the immigration system and just needs verification via the presented QR code.
@Suiseiseki I don't think it is that easy. When the QR code is presented at immigration, the immigration officer must still check the passport details that appear with the people that are physically present. Any mismatch in appearance or numbers would require more checks.
So, the process is no different from a criminal trying to use a stolen or forged physical passport.
BTW, Singapore's airport also doesn't do physical passport checks: it relies on biometrics at automated gates.