The GZ had a serious list problem that would have made carrier ops in anything other than calm seas dangerous at best. It just wasn’t a well balanced design.
There is that. It was a prototype, and it showed.
Her catapults were air powered. Thus, she could launch 18 aircraft, and then her tanks would have to be recharged.
I understand that there were not provisions for a rolling take off.
She had 16 (!) 15 cm guns, in casemates (!!). That is a
lot of wasted weight. True, other countries had tried it, but they were removed from other contemporaries. Casemates were long since known to be obsolete by this time.