Bimbling around at 200' in the same sh8te weather following a coast is an invitation to CFIT that sadly many have taken up and regretted.
I don't see why. As you know helicopters can fly slow enough to enable the pilot to see ahead. You gave the vis as 1500 m. More than enough.
and I assume they got where they were intending to go because D&D didn't call us to search for them - both flights were completed
So why the rant?