I don't know much, but my guess would be that smaller planes are more prone to both of these issues? The DC problem was a collision between pilots who didn't see each other in time, which seems more likely with a smaller plane, and this seems to be because of wind/traction, which also seems like it would be more likely with a less heavy/large plane?
Smaller planes fly more often, and there's a lot more of them, so statistically they're more likely to be involved in any incident.
The DC collision was an accident waiting to happen, but that airport only serves single-aisle jets and runway 33 can only be used by the smallest of those - like the CRJ and Embraer model.
And in this case, it remains to be seen what caused the unexpected roll.
