The way Design Signals resonate with me is that they are:
a. designed, meaning that there is an intention behind them to be valuable .. compared to other KPIs which often exist only because we have data.
and
b. because if we know we need to know something we can design the experience to produce this signal.
c. I have not understood Design Signals to be standardized .. and I would hope they aren’t. Because if (I would propose) two competitors measure the same thing they will end up becoming more similar (race to the bottom) instead of incentivised to become different.