McKeever didn't have enough time to wreck BoP? How long did it take Beechem to wreck Cass? A writer can do a lot of damage, very quickly. You see, McKeever making Charlie suddenly not only incompetant but a liability, otherwise, also damaged Barbara as a leader for letting this suddenly incompetant person on the team, and the rest of the Birds for accepting and supporting having Charlie there.

You're using McKeever's mishanding of Misfit to justify your dislike for the character. How is that not exactly like how Cass bashers use Beechem to justify their dislike of Cass?

"To portray a young woman of Charlie's age as hyper-competent consistently is just ridiculous."

Cass wasn't a whole lot older when she started as the hyper-competent Batgirl.