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Yes, recommended.

When you upgrade from one Mac to another, you can use "Migration Assistant" to get all your apps, docs, and settings on the new Mac. This _also_ brings across all the leftover cruft from apps you no longer use, but whose data is still in your ~/Library folder (hidden, contains the working data for most apps)

Repeat a couple of times, and your current Mac will have large amounts of files that are leftover from your current mac, your previous Mac, _and_ even from your earlier Mac!

"Clean My Mac" will help remove this accumulated cruft.

Source: Mac developer whose product is guilty of using ~/Library to store a large database.

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