The anticipated "safety dividend" of the all singing, all dancing glass ( and they really are great, I love synthetic vision) has proved to be somewhat elusive.
There never was an anticipated "safety dividend" - simply because glass wasn't introduced for safety! It was introduced because one screen is cheaper than six mechanical instruments, because GPS became accessible (so you had to put in a computer of some sort to access that, anyway) and because computers give greater functionality (for those geeky enough/disciplined enough to learn ALL of the functions of a particular system).