I really don't mind the Trinity back-ups. I mean, at this point of history we've had more Trinity issues than Artemis or any of the wonder girl issues. Like I said in other previous ocassions, I mind more about Wonder Woman and wonderfamily members not appearing on other series, which is what SHOULD HAPPEN.
Anyways, i see the back-ups themselves as pretty inofensive, not occupying plot pages (which are more or less fixed since 770) and just adding a counterpoint of fun to the more serious plot. Would want the wonder girls showing up there? (alltho it would reveal plot details) Yes. Do the supersons stories exclude something else? Probably not since mainstream readers wouldn't buy this series if DC put any other author than Tom King doing the back-ups (and you're not going to get Taylor/Snyder/other stars to do just back-ups)
Also, I think King writes Supersons better than Tomasi, which is nice.