Let's say I have a Lightning node, and want to shut it down. All its channels have been closed, and its onchain wallet has been drained.
Is there any reason why I'd want or need to keep some or part of its data directory around? If this were a Bitcoin onchain wallet, a possibility could always exist that someone would still send coins to an old address, and hence, I may want to keep around its key material forever.
My understanding is that this is not the case for a Lightning node, as all ways of receiving money involve interacting with my node. Is that correct, even when talking recent protocol improvements into account? If it matters, it's a Core Lightning node.