Specializes in hardware? Yui clearly was the best girl in this whole series. After becoming a witch she handled that bear exactly how I expected she would the first time she appeared, so yeah, she just needed a bit of magic to be able to do what she wants.
Unfortunately relying on magic was a mistake, I was wondering why the manga was called that the whole time, it makes sense as an ending because everything was established properly beforehand, but it's hard to believe Touko would choose to stay alone in the fairytale land when she was being assaulted every 5 minutes by a different girl each time.
I hope the author eventually gets to write that sequel they want to write, because there is definitely room to expand on these characters now that we know their circumstances.