Do they?
Maybe resume's specifically do suck, but surely it's beneficial to have at least some way to see an overview of what a candidate has accomplished in the past. Especially when you're hiring for more senior roles where you need to place more value on experience and a proven track record than raw technical excellence. I can't really see these "anonymous" interviewing platforms working well for those kinds of roles.
I have seen hundreds of CVs that show no achievements of note - and tend to be more along the lines of describing the duties of the job and little else besides. I've also had hundreds of subsequent conversations with those people that revealed significant accomplishments.
CVs are better than nothing. But there's no set way to write them that's widely known, and people tend to be rather reticent about their own accomplishments - perhaps not even thinking of them as such. There's a lot of value being left on the table.