I do not understand your argument at all, sorry.
tialaramex is mis-reading "do not as a rule" as "never" and then constructing a straw man based upon that, and is also asking you to specifically name any CA that does what you say many of them do. (-:
You say DNSSEC validation is "too broken" for any public CA to be doing that, but actually the largest (by issuance volume) does exactly that
Whereas you say multi-perspective is so prevalent "many of them" do it, but you aren't able to produce any examples at all.
Maybe time for a re-think?