Doing a 'just because', I'll give a reasons for the Nokia 9 return.
First and foremost, the fingerprint scanner. It simply doesn't work that well. I am a bit worried about the Sony situation here though.
Second the camera. It's very slow. Slow to start up. Slow to switch between formats. Slow in general. This camera is for people who have time and lots of it.
Picture quality is OK. She didn't have the depth turned on but it shouldn't need that for every picture.
Third is the missing camera button. As my wife isn't used to using the touch screen she kept having problems taking pictures. Sounds funny but overly frustrating when you're used to doing things a certain way.
Fourth the phone is slippery. To the point that even the slightest tilt of a surface it's going to slide. This is mainly due to the phone not being flat anywhere. So for anyone interested in getting this phone, definitely get a case.
My wife did stick to her assessment of the phone appearing 'manly' and I somewhat agree. it does have a certain masculinity to it but I don't see it as a completely 'man' phone. The colour didn't work for her and this is why she's gone the silver white for the Sony.
Other than being Android One and the screen which is lovely. This is not the best device that HMD could have made. It's rather disappointing. They would have been better off with the three camera set up and add a camera button and SD card. I think more people would have liked that. The 5 camera thing is to stick out from the crowd and yeah congrats on that but what you have here is basically a decent phone with a crap fingerprint scanner and a disappointing camera experience.
I've heard rumours that their next 'flagship' will have more cameras... this is not encouraging.