Maybe we just have different views on the definition of Lighting and Climate.
For me, the term Lighting means a device used to bring an approximation of sunlight into an area without sunlight so that I can see better. This is why, to me, things like seasonal decorations, pictures and other decorative objects seem out of place as a Lighting device - they aren't used to approximate sunlight, or to help me see better in an area without sunlight, they are simply decorations.
Likewise, Climate, to me, means a device used to control the comfort level of the air (just as how the term is used in weather - temperature, humidity and wind).. This is why waterfalls, swimming pools, irrigation, etc seem out of place in Climate.
My point is, there is your view on these definitions, there is my view on these definitions, and there are probably an infinite number of views inbetween - depending on who you ask. By having an Automation or Devices type of category, we move from a setup that fits only one type of view, to a solution that can pretty much fit anyone's type of view. (I.e. if someone feels that Device_X isn't a light, and isn't a climate device, then they certainly can't argue that it isn't a "Device").
And don't get me wrong, i'm not trying to be arguative or trying to change your point of view. I'm simply trying to state that there are other points of view on this (and not just my personal point of view) and I feel its important to have a system designed that can cater to everyone.