I am neutral on patina preservation on contemporary guns. Personally, I like the look of the appearance of some well earned wear and tear on a gun, but nothing wrong with bright and shiny on a new gun.
From the ‘financial’ or ‘investment’ point of view, it seems patina or whatever one wants to call it attracts more than it’s share of buyers and might be the smart move. And especially with an original piece, collectors, the smart money appears to be with the leave it alone crowd.
Ultimately it is easier to clean up a gun, new or old, than return it to how it looked with whatever earned wear and tear it may have had before a clean up.
All comes down to what the current owner of the gun prefers.