It's the lack of reality in operational policies that is the real
of frustration in ops communities. People are picking on shim6 because
it is used as an argument to back the current policies at a time
doesn't even have an early alpha-implementation to show for it.
built around shim6 may be ok in 5 or 10 years if or when it is mature
with supporting technology to handle large networks, but not now.
meantime we need a policy that can accomodate the need for multihoming
of end-sites with *existing* technology. Without such a policy we will
have anarchy with LIRs making their own policies (fragmentation) and
people telling lies to qualify as a LIR to obtain independent blocks
(unless there's a way to delay v6 deployment until there is technology
available to back the current policy).