Those three examples are not haiku. They are zappai (or even senryū, the last one) because there is not a kigo (a reference to summer, autumn, spring or winter) and they just reflect ideas, not feelings nor amazement.
It is not necessary to express a lot words in a haiku. It is about to be precise and specific. For example, this one by Bashoō is more philosophical than the rest:

Oh, tranquility!

Penetrating the very rock,

A cicada’s voice.

... What an excellent haiku for summertime, right? :smile:

Haiku is not a Zen souvenir. It is Japanese art and literature. To compose a haiku, you need to work out on Japanese aesthetics previously.

William James (sort of)

Is it true? Who cares?
What to do next is what's key
What's useful is true.

Welcome to the forum.

Haiku is not a Zen souvenir. It is Japanese art and literature. To compose a haiku, you need to work out on Japanese aesthetics previously. — javi2541997

Javi is Spanish
But his soul is Japanese
He is passionate

Javi is Spanish
But his soul is Japanese
He is passionate — T Clark

You know I love when you say my soul is Japanese. I have not visited Japan yet. What will happen when I would do so? A criss-crossed between my mind and soul?