Because KeepassX is way less used (and its source code checked) than ... QT for example, so rogue functions added into KeepassX will be have less visibility than one added into zlib.
So if there are rules to improve the privacy of users, I would worry about making it look to complex or extreme. I suspect rather than picking some parts that work for them they will go "ok this i can do, this I can do, and .. wait compile it myself and read the source?! - ok, I'll stick to post it notes".