Except that's not true because rendering a target's device unusable temporarily and/or effectively permanently is a useful payload regardless of what you think.
A useful payload for whom? Point me to someone who is willing to pay for such a bug and I'll believe you. Zerodium's old payout scale didn't even list denial of service, and to my knowledge no other serious vendor does either. If I can list a bunch of people who don't care about this surely you can find one who does.