Pondering the "Glass of Water Theory."

It seems there is something called the "Glass of Water Theory."
It is about how one perceives a glass that is half full of water.
"Still half full"
"Already half empty"
How do you perceive it?

There was something similar in a commercial for a carbonated drink.
"Do you think there is only half left?"
"Do you think there is as much as half left?"

When it comes to a carbonated drink, the story changes...

One could end the discussion by saying that "still half" is "positive thinking" and "already half" is "negative thinking."
However, I feel various implications in this theory.
First, there is the part about it being a "so-and-so theory."

First, the part about it being a "so-and-so theory."

I suspect many people perceive the term "so-and-so theory" more in the sense of (2) than (1). I asked ChatGPT for famous examples of theories.

"These theories play important roles in their respective fields and serve as the foundation for much research and discussion"—that is the image I have as well.

The Glass of Water Theory...
It certainly gives the impression of psychological research. I feel there is some important message. However, it does not seem to have a specific proponent.

Next, I am concerned that the preconditions are not stated, and that the choices of "still half" or "already half" are too limited.

If I add the condition that "I will drink this water" and consider my "level of thirst."
Very thirsty -> "There is only half left"
Not thirsty at all -> "There is still half left"

And if I am finally able to drink water, I think "I can finally drink water." Furthermore, if I am in an extreme state, I would "gulp it down" without even thinking.

If there is no condition about drinking it, it is "just half a glass of water."

Also, if you look at this from a management perspective, the story changes. Management scholar Peter Drucker (1909–2005) said this:

" When it changes to 'half empty,' an opportunity for innovation is born "
It is neither "already" nor "still," and it is neither positive nor negative. He says that for an opportunity for innovation to be born, the "perception" that leads to the action of it being "half empty" works effectively.

The 'Glass of Water Theory' carries a message that seems to have some meaning, leaving the underlying conditions to our imagination.
I feel there is a mechanism that induces cognitive errors, and I become wary that it might be trying to deceive me.

I like thinking of the world in binary terms as a form of humor, but when it starts being used for enlightenment, I become wary of malice.

I feel that indicators that do not show research methods or sample sizes, or that only show indicators convenient for the results, are similar to that.

Being 'easy to understand' and 'easy to visualize' is important, but it can also cause cognitive errors.

I was pondering such things with the glass of water theory.
Perhaps caution is also necessary when something is 'easy to understand'.

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