>   > create a tunnel.
> 
> => I guess you would give the same answer
> for link-locals and many other cases. 

link-locals are there for autoconfiguration, not security.

> So, if you have a tunnel, secure it. 

answer is non-responsive.  we were discussing unauthorized
router modifications.

site locals do not result in a meaningful improvement in security to a
site of nontrivial size -- any node with a global address may
unilaterally "choose" to extend the site...

                                                - Bill
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