More RPM tolerance in workouts

Sometimes it is impossible in workouts to reach both the rpm and the Watts. I think that most trainers doesn’t have a real rpm sensor. But now you don’t earn the stars in a workout because you don’t reach the rpm requirement. Zwift says on his support that it’s most important to reach the Watt requirements. Is it possible to increase the rpm tolerance so you earn more stars?
Or maybe that the RPM is just an advice and not a requirement for earning stars.

You don’t have to hit the RPM to get the stars only the power.

Strange that I don’t receive the stars. The watts are always shown in black and if you didn’t reach the watts the colors changes. But most of the times I don’t receive the stars.