What does a DNSSEC-protected priming query gain you?

I was about to ask the same question.
    
    Accepting any old priming query and having a root SEP configured, if 
    the query is right all things work.  If the query is wrong/forged you 
    won't get anywhere any how.  (Without going into the weeds here - 
    what if one IP address were forged, what if it were 6, 16, or all of 
    them?)
    
    (13 name servers => 13 A records + 7 AAAA records last check)
    
    Besides the warm and fuzzy feeling, what do you gain? (Keep in mind 
    all of the TCP traffic it would take to get warm and fuzzy.)

I think that this is also discussed in Koch's priming draft.

        jaap
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