Occasionally, a flight will encounter bad enough weather that the crew will become disoriented. While tools like a terrain radar, ILS, and GPWS/TAWS do help the pilots regain orientation, they're not universal; some aircraft aren't equipped with terrain radar, ILS only works on approach to runways supporting ILS, and GPWS is pretty coarse and primarily aural, not visual (beyond a flashing warning sign) on most aircraft. This means that there's still a risk of overshooting or undershooting a runway, or even controlled flight into terrain.
Some higher-end private aircraft have started incorporating decked-out glass cockpits which, among others, can include synthetic vision systems -- these can show terrain, glide slopes, and other traditionally VFR elements which can otherwise be invisible during night flying or in poor weather.
I haven't seen high adoption of these kinds of systems even in brand-new airlines, though; is there a technical reason why these aren't being included (or even mandated) above a certain type rating? Is it purely pragmatism while the system becomes more ironed out? Or are the hurdles before adoption purely bureaucratic at this point?