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"But growth is countered by a force - a selective and corrective system in the Tree's rivalry against the Sea."
"A natural system based upon the Imaginary mechanics. It breeds, nurtures, tests, and removes."
"This is what humanity describes as the Honkai."
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The explanation above states that the ‘Honkai’ phenomenon occurs because the tree and the sea compete with each other.
The ‘Honkai’ phenomenon, simply put, is the repeated cycle of birth and destruction.
However, HSR's description of the imaginary tree includes the statement that birth and destruction are repeated.
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wiki.hoyolab.com
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This theory describes the various worlds existing in different spacetimes as having a tree-like structure. Every branch is a specific path along which worlds might exist, with every leaf being the marks these worlds have made along the parameter of time. The crown of the tree remains in a dynamic state as it absorbs the masterless Imaginary Energy from the space-time vasculature of the trunk. New shoots grow, withered leaves fall, and endless births and deaths occur among the infinite universe... Describing the universe's structure as a "tree" may be an attitude that views the Imaginary Tree as a life form.
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