It's a metric of interest, but it's uninteresting if we can't measure it properly.
To get a good estimate we'd have to randomly test the population, instead of measuring people with symptoms. Since a lot of people are asymptomatic or don't get a test since they don't feel too sick. Picking people at random would give us a good overview of active cases.
In March in Germany they were reporting a doubling of cases on TV every day, but they failed to mention that they had administered almost twice the tests as well. So basically the number we were measuring was the number of tests we could administer, which was naturally rising as testing capacities expanded, not the number of Corona cases.
Deaths just seem way more reliable a measure.