Here’s another, similar discussion from last year:
High storage consumption in ERPNext, is this normal?
From my perspective, here are the challenges with any hypothetical “Archive Tool”:
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One person’s "junk data" = Another person’s “very-valuable data”
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Ask 100 ERPNext forum users for Archive criteria and rules? You will get 100 different answers.
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It is extremely easy to break Frappe/ERPNext by accidentally deleting the wrong tables/rows. Likewise, you can also break it by not deleting too-few related rows.
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Assume ERPNext had such an Archive Tool. Some people would make mistakes. Some of those mistakes would lead to data loss. And some of the data loss would lead to angry blame, and potentially legal actions.
I personally believe (with no evidence to support my belief) that the reasons above are why no Archive Tool has been developed yet.