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Also, the (standard pressure) "oiled" case, with it's reduced grip against the chamber wall, will not put any more stress on the breeching than what a (standard pressure) case head separation will produce.

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Only if you manage to load an already seperated case! The force needed to tear the case apart can not work on the breech anymore!

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That's not correct when dealing with some double rifles.
For example, owners of 9.3x74R doubles, who reload Norma cases, often complain about case head separations on just the second or third firing of a reloaded case. This is with standard pressure reloads, and it happens often, due to the extremely thin case walls of Norma brass.
In those instances of head separation, the case is already partially separated on the first firing, and on just the second firing the breech will need to endure the full thrust, which is at least equal to, and probably more than what would happen with an oiled case.

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