The issue there is that the hardware is full of totally absurd bugs. If you target PC-like userspace or one of the two major mobile platforms it is somebody els

The issue there is that the hardware is full of totally absurd bugs. If you target PC-like userspace or one of the two major mobile platforms it is somebody else's job to shield you from that. In general CPU level bugs are somewhat rare, but every single platform vendor had shipped some kind of silicon that contains peripherals that do not work as documented and only by chance work with the reference driver implementation.