My thoughts are that Holdo was more than competent in the theatrical version of TLJ.
Perhaps competent isn’t the right word. What bugs me about her character is that she comes out of nowhere, we’re suddenly supposed to just go along with her plan (which the audience doesn’t know about), and then in the end, she saves the day?
Having Ackbar vouch for her is something that make it feel more complete, in my opinion.