We need better visibility so we don't kill people or put crews who have to deal with the fallout in danger.
A higher barrier painted in reflective paint and generally more visible to drivers would be beneficial both to the pedestrians/cyclists, and other cars on the other side of that barrier (for safety's sake) than what is there now.
Additionally high centered cars have to be removed which puts the crew removing them at risk. It is better to avoid this by making a higher/more visible barrier than it is to leave it like this and hope some idiot in a car doesn't actually crusha cyclist on the other side.