I feel like decay should not affect boats and buildings far from major monuments (water bases for example), but I don't know Rust server administration so I have no clue how it should be implemented (or if it is even possible).
I get that decay gives an endgame objective to those near wipe who already have full chests.
My friend and I started playing very remote from the continent, doing a few things here and there with a small port and a couple boats, and we have to mind the decay of the port, the decay of his boat, and the decay of mine...
I'm going to vote no to keeping decay for that reason.