I think that deprecating the O & M bits will be good. I'm not too worried about incompatibility, as most code do not support those bits anyway. Also, it is mostly an operational issue. All we need to do is to publish a BCP saying essentially: "Do not set the O & M bits in RA" and we are done.
In terms of harm, I think leaving O & M is harmful, as it keeps confusing people.
A good design is not one where there is no extra feature to remove,
not one where there is no new feature to add.
- Alain.
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