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Re: IPv6 w.g. Last Call on "Link Scoped IPv6 Multicast Addresses"

The document says:
  scop <= 2.  The value of this multicast address is necessary to 
  distinguish between an Interface ID-based multicast address and a 
  unicast-prefix-based multicast address.  If scop <= 2, the former MUST 
  be used.  That is, this document updates the [RFC 3306], which 
  describes the latter. 

I'm trying to understand why the RFC 3306 are so broken for scope <=2
that they can not be used.
While using the new address format for scope <= 2 would presumably be
preferred I don't see why prohibiting (as the "MUST" above does)
the use of RFC 3306 for those scopes.

If prohibiting them is the right thing I think the document should state why.

The example says:
  This is an example of an interface ID-based multicast address with 
  link-local scope.  For example in an Ethernet environment, if the 
  link-local unicast address is FE80::12:34:56:78:90:AB, the multicast 
  prefix of the host is FF32:0:1234:56FF:FE78:90AB::/96.  For SSM, 
  multicast address will be FF32::/96. 
Typo (I think): FE80::12:34:56:78:90:AB should be FE80::1234:5678:90AB

and a better example would have a 64 bit iid (the above one has 16 leading
zeros). Such as
resulting in


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