You said that dual citizenship shouldn’t be allowed. Do you think that someone applying for German citizenship should be forced to renounce any other citizenship in order to receive a German one? Because that’s what the law used to be. And many people had and have reasons for not wanting to give up their original citizenship that went beyond the sentimental (not that pure sentimentality is not a valid reason).
Hair ties, hair clips, hair pins, those spiral thingies you twist in (no idea what they’re called in English) and hairspray to keep it from fluttering about. Lots of ways to keep your hair up and in shape, depends on what exactly you want to achieve.
That said, I don’t know anyone, like literally anyone, who thinks that keeping your hair up is more comfortable.