Is this 0.0001 dust accumulation primarily due to negligence? Or is some other mechanism leading to so much of it? If anyone has ideas of other things to look into I'd love some suggestions

Since you don't mention when those UTXO dust created, i would speculate most of them are created by Ordinals. See
https://bitcoin.stackexchange.com/a/118262.
OP can verify this data by analysing the dust accumulation over the time and see if it's spikes exactly when the ordinals started spamming the network.
The other contributors are some wallets which doesn't allow coin control lead to created unnecessary dust amount into the change address.