It's not so mysterious to me.
- He's generally pretty good at cornering and descending, especially on his TT bike. Less so in the rain
- He's bad in anticipating and responding to movements of other riders, especially in a big, frantic peloton
- He's a former ski jumper and an adrenaline junkie. This means he's less risk averse than he probably should be based on his bike handling skills.
In my mind the bunch is split into 3 danger zones and Rog tends to constantly exist in the worst. The back of the bunch is safest, except for inattention (like Gaudu's crash last week) and the resulting time loss. The very front of the bunch is also generally better but that's always populated by big rouleurs/teammates and the GC guys with lots of energy and yes, good handling.
Then you get the danger zone. That area immediately behind the front of the bunch stretching across let's say between position 10/15 back to position 40. That's where Rog exists, along with the likes of Bernal, Tao GH, Tiberi, Ayuso, Evenepoel, Mas and most others. And to no one's surprise those are the GC riders often listed when the ominous caída/chute/crash whatever shows up on the TV graphic.
And something else to note is the bigger teams with lots of power now drill it hard whenever they're approaching a danger zone, always accelerating into pinch points, sharp turns and narrow sections.