Is there alternative to WP_List_Table?

My choice would be to use WP_List_Table. If you continue reading the Codex it makes it clear that it is commonly used by third party code. “Someday” it might go away, but I doubt it will happen abruptly (if at all). If it does change, there will probably be a newer solution to replace it.

EDIT:
Another thought. if you feel really can’t use WP_List_Table the answer is in your question: “If you would still like to make use of the class, you should make a copy to use and distribute with your own project,…”.

Just give it your own class name, then it will never go away.

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