Different people make different decisions about what to do in any estrangement. They do what they feel they need to do at any particular point in an estrangement, whether they are estranging or being estranged.
There seem to be some astounding assumptions being made on this thread about motivations; place an action comes from; purpose of actions/decisions taken; impact on grandchildren (as adults); behaviours of parents; behaviour of grandparents; behaviours of EAC and so much more.
Most of it seems to be complete conjecture, whilst trampling on people trying to find a way through a sad situation. . Many have tried to deal with the problem directly whilst alive, and have got nowhere, for various reasons. So understandably they try to find a different way to leave a message about their love after they have died. The consequences of that decision will vary, and is something that those left behind will deal with. They can't be protected from all the consequences of estrangement.
None of us know how our adult children will respond in different situations. Those who have estranged, each for different reasons, may well think/assume that their children will "support them" /ignore it if left a legacy. There is no guarantee of that, just as there is no way of knowing how adult grandchildren will react.
The messages they take from any legacy is for them to take, depending on how they have grown up, what they have been told, how their parents respond, their understanding of the background to the estrangement, how much they can think for themselves.
What if , on receiving a legacy/box, they feel that they were loved after all by grandparents who they knew when small, and loved, who cared for them, and then who suddenly disappeared? That could certainly be a possible scenario for some of the estranged GPs on here.
That would be the opposite of the negative messages suggested. Both are possible in different scenarios and that should be recognised, not the negative assumed
Ofcourse an ideal is to reach out whilst alive etc. But in reality ...that is so often not an option!