It’s true average viewers don’t care. However, the quality of pros impact the level of dance and choreography. The quality of dance, nowadays, is so poor Bobby Bones can get 10s. Using shadow choreographers is one of the reasons we don’t see as much rehearsal footages as we’re used too. So yeah great pros make great show.
And I’m not suggesting to bring back the OGs because they’re old/burned out/moved on. Deena can recruit new blood by going to competitions instead of watching sytycd from her couch