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at the recent apnic policy sig meeting, where these proposals were discussed, okutani izumi said something that made, at least for me, a clear motivation for this.
under current policy, when we near the end of the iana free pool, an rir can not be sure if it will get a last request or if not. it is not predictable because it depends on timing and the other rirs.
this is like a game we have in my culture (and i would guess is also in many others), 'musical chairs', where n players have n-1 chairs which they walk around until the music stops, and they all try to sit in a chair. of course, one will not get a chair and is eliminated. (the game continues with n-1 players having n-2 chairs, but that is not relevant here.)
current policy makes it terribly hard for an rir to plan for the last /8 because they do not know if they will actually get one. with the jpnic proposal, they can plan for at least one /8, and set policy accordingly. and apnic, for one, has strong sentiment that this last /8 should be used in the region with specific special policy.
now, it is true that one can not know if and how much an rir will get from the iana in the allocation just before the last one. but the jpnic proposal at least removes the uncertainty by one large step.
this actually made sense to me.