The incident in LV with an airliner having to evacuate on the ground is fairly typical. The problem is fire/smoke inhalation and a quick evacuation is necessary to avoid casualties. The incidents with aircraft impacting the ground at speed off the airfield are mostly not survivable. The so called "miracle in the Andes" was a fluke. The aircraft lost both wings before impacting the ground in such a way that the fuselage remained mostly intact -- very improbable. A few meters difference and the fuselage could have impacted the first peak rather the wing.

But as improbable as surviving that crash was, it's not the same as what happened in Vegas. In the Andes, there was no reason to evacuate after the fuselage stopped sliding. Carry-on bags were mostly/sort-of where they were so any supplies were still available.

Every crash is different but there are many potential similarities. Fire can be a big problem, whether it's an engine fire on take-off right next to those big fuel tanks they call wings, or a brake fire on landing right under those fuel tanks; fire is a major concern. Get out of the aircraft with what is in your pockets, just get out. The aircraft will be surrounded by crash trucks within minutes. If you need to leave your meds behind, just let one of the EMT know what you need. They might not have it on-hand but they should be able to get it. Point being, you'll be outside the aircraft able to ask, rather than inside dead of smoke inhalation and you will know that if anyone is inside, you did your part to get out quickly.

If I'm ever on a trip over the Andes, I'll have my own PLB in the pocket of my winter jacket. That and other suitable winter clothing is the only stuff I'll need.