You are right, at least they have closure. Lost at sea is an ending that has no closure, they know definitively that while they are gone they are not lost and they do not need to hold out for the slim chance that they will be found. Nothing about this is easy for them, but this is easier than waiting weeks and weeks while hoping.At least the families know where their loved ones are buried at sea. Many loses at sea are indeterminate on location. Also, the area is already a memorial, and even visited, if only by the few. I'm trying to look at the less grim side of this, but I'm sure the families are grieving mightily. Condolences to them.
Perhaps some family members and friends will be able to visit the site on a surface ship and scatter flower petals and wreathes at the location, to honor their lost.
Perhaps this will serve as a warning to many and save some lives in that way.
I'm waiting to see if OceanGate steps forward and offers to take the families to the site for a memorial service. It feels like it would be the right thing to do if the families are interested.