First off, there is an incentive to reuse addresses rather than rebuild shares on new address after each payout. If you make a mistake and link your identity to one utxo, you dox them all. For lightning payouts I guess that's not as much of a concern. Also, because the address is linked to your exact hashrate it would be easy for someone to determine what kind of equipment you have. It's just a lot of information out in the public that can cause trouble in the future. Takes some consideration. The pool I use has automatic paynym payouts, so I get low transaction history utxos, kyc free, to new addresses every payout and they don't have my xpub.