Why is there no mechanism to learn DNS addresses through router advertisements?
=> A couple of years ago there was a DT that compared several different ways of achieving this. The proposal you mentioned was one of those addressed. The DT settled on assigning 3 different site-local addresses that can be reserved for DNS servers. The solution was documented in a draft (I believe Itojun, Alain and Dave Thaler co-authored it). But this idea didn't get concensus in the WG and I think the draft is dead now but I'm not sure. DHCPv6 allows for DNS configuration in hosts among other things.
Ok, I only have one word for this: unacceptable.
I stronly suggest everyone who was against this to try running IPv6 for a few minutes.
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