At least oil the bore and lock internals. There is nothing like an old machine rusting up to kill its value.
You need to find a different drum to beat. This one is out of tune.
People have repeatedly pointed out that there is difference between cleaning that often damages the gun and preservation to stop deterioration, this distinction seems to lost to you. They can can be radically different things if done improperly, preservation can actually produce deterioration. What if removing the lock causes more damage than the oiling can prevent? Then what?
Lots of old guns have been seriously damaged by idiots with cans of oil. Petroleum oils, something like 3 in 1 for example (and probably other things as well), causes a kind of wood rot if allowed to soak into the wood by over oiling. Black streaks in walnut. It takes time in many cases 10-20 years maybe 40. But time is what we are talking about with old guns, time. Stored muzzle up even light coat of oil in a bore can run out the vent/nipple and into the stock. So we preserve the bore and seriously damage the wood? In a Kentucky toe WOOD is the important part, its more important than the bore, though the bore is also of interest to me. So after oiling rifles should be stored muzzle down for a day to let the oil run out the muzzle. People would be surprised how much oil runs out if they check.
So ALL such things need to be done minimally if at all. There is often a fine line between preservation and long term damage that might crop up long after the perpetrator has traded the gun off or died of old age. But the gun is still damaged.
Dan