Some examples?
Compare it with something like Firefly that still hasn't managed to make a series comeback.
But it became a movie.( I liked it but it did not do well at the box office).
Also, Nathan Fillion has been a little busy, 8 Seasons of Castle, now The Rookie going into it’s 5th Season.
Also, Joss Whedon is in the super Dog House since his past behavior has come out.
Even was fired from his new HBO Max show, The Nevers.
I would counter that The Orville isn't exactly distinguishing itself in season 3 as compared to where it appeared to be headed in season 2. The critics appear to be raving but the viewers are less excited (75% on Rotten Tomatoes).
The fact that views on streaming services aren't particularly synchronized may be hurting these shows as well. That a significant number choose to binge (either as a practice or a money-saving scheme) puts the hurt on the show's buzz (unless it is a "must see" like Stranger Things").
The Orville has never been a rating winner, mid level at best, I have always enjoyed it but not a lot have.
For example, first show of season 1 had 8.56 million, by the end of Season 1 down to 3.54 million.
Second Season, first episode-5.68 million, last-2.97 million.
I was amazed they renewed it for a third.