With breaking/recover problems that clearly have not been fixed we might see cars have strange behavior eventually snapping unexpected movements excursions or sudden stopping.
To that add fatigue of a first race and much more complex cars to manage, plus many problems that might occur by a pilot that might rob attention from pure driving and a splt of a second might mean a crash or not if suddenly a red light appears in the wheel and some control needs to be changed.
With more weight and more top speed it also builds more energy to dissipate in impact. Then electrical issues and batteries - something that Newey noted - increase the fire danger issue.
I think an increase of odds of something serious occurring should be considered by marshals, drivers and rescue/medical services.