It doesnt matter what Joyboy's will is. WE as readers know the Weapons and One Piece are needed to resolve the plot around the world government and their world state
And I dont agree they were not meant for destruction. But that doesnt mean thats a bad thing.
A common theory is destroying Red Line under the WG. Its why Noah potentially exists, to protect FI from the fallout of the promised time. But again, this still requires the WG to be the final antagonists.
The One Piece is a treasure that Joyboy left Laugh Tale together with the messages for the next generation, it's his will, that's why he left it there.
Yes those ancient weapons have destruction nature but their purposes weren't use to kill people. This is certain for Pluton as the creator left the blueprint for the future to counter whoever misuses it. Luffy doesn't even want the ancient weapons when Robin asked him which I think they aren't mean to harming people.
The WG is slowly collapsing before anyone gets their hand on the ancient weapons, it's likely they will fall and split before the destruction of Redline.
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They were defense systems originally.
Defense systems vs. weapons systems
Yea probably or maybe terraforming.