. https://www.searchenginejournal.com/why-using-conversions-imported-from-analytics-to-google-ads-does-not-actually-make-sense/346036/#close

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WHY USING CONVERSIONS IMPORTED FROM ANALYTICS TO GOOGLE ADS DOES NOT ACTUALLY MAKE SENSE
As an alternative to setting up Google Ads conversion tracking, you can import conversions from Google Analytics, such as goals or transactions, and then use it for optimization of your Google Ads campaigns. It is not a new feature, and its use by advertisers is a common practice. It became even more popular recently, as the Smart Shopping campaigns require conversion tracking with transaction-specific values. The import of Google Analytics transactions is probably the easiest way to comply with this requirement if there is no Google Ads conversion value tracking in place. WITOLD WRODARCZYK READ MORE