The use of the 'I' subject is very rare. Except if it is an external description, like a view from outside.
In the same idea, personal feelings are excluded, at the first level. Haiku describe the world. I can however introduce a personal feeling, at the second level, through the creation of an "atmosphere" based on an objective description leaving the reader to reconstruct the personal speech.
This intentional retiring has something common with the zen spirit, the lack of ego, or the taoist conception, device contempt, characteristic of the Japanese way of thinking.
In
Japanese, the subject is generally absent and singular and plural are not
differenciated.