Question 2 has a neat answer: the kitchen is where the food is, and that is precisely why it is less special.
You go to the kitchen many times a day, at unpredictable moments, and she can get your attention there any time she likes. There is no scarcity. The bathroom is a limited-availability, high-attention window with a known start and end.
There is also a plainer version: in the kitchen you are usually doing something with your hands and moving about. In the bathroom you are as close to a stationary lap as you ever get outside the sofa.
Cats optimise for access to their person, not for proximity to food, once food is reliably available. This is the same reason a cat will ignore a full bowl to sit on the newspaper you are reading.