> But I also think all interviewers having a veto is the wrong approach

It's based on people assuming that others will use that veto reasonably. Company i work for had a veto system but i don't think it was ever used. It was also essentially 3 level system "hire", "probably not" and "i object to this person ever working at this company"

I've heard the latter being expressed a few times but only with candidates that nobody was keen on.