I didn't love the 60 Minutes interview either. Harris is admittedly not perfect as an interview subject unless it's more casual (which is to somewhat be expected after being kept often in reserve for four years, and only having two months to pull this whole thing off up to now which has been remarkable) and I find she too often leans on canned answers in those more buttoned-up settings, whereas I do think she thrives and excels in debates or live on the stump, or with more unconventional or less Beltway-centric outlets. I do think with more time she'd do much better in this kind of format, but we haven't had any and regardless it hasn't hurt her favorables which keep going up.
But I also felt Bill Whitaker's performance on 60 Minutes was lousy. It was the classic old-school TV interview of brief soundbites, too much editing down, too much voice-over by the anchor and not enough substantive discussion, and most of his questions were merely gotcha framing shots out of the old GOP playbook (Trump says this/what do you say, how are you going to pay for it, etc). So in that sense I think it only proved Harris' team right for going to Stern, to Call Her Daddy, to The View, to NABJ etc. And I think those will all work well.