This is the thing, people will argue that 'singing' and 'dancing' is something that's a personal preference.

This is true to a certain extent. I don't quite understand how people argue that she can sing when singing has always included: being on-key, having a voice that does not crack when notes are sung, and being able to hear the singer without amplification or computer editing software. Talking, is now considered 'singing'.

I don't understand how people argue she can dance if she appears stiff, often does the exact same moves with little variation, and does not appear very smooth/fluid.

If this is the type of singing and dancing people like today, fine. But I believe people like her more as a person, than as a performer. I don't think there is anything wrong with that. What I don't like is people trying to justify why they like her by using things like singing and dancing....when it does not seem to add up. Even based on something like 'personal preference'.