With CRM-to-GA integration, you’ll be able to use the advanced Google Analytics reports with revenue data (e.g. multi-channel attribution reports).
The purpose of CRM-to-GA integration is the same as GA-to-CRM: to show you the ROI of your marketing campaigns. But CRM-to-GA allows you to see the ROI data in Google Analytics reports that have certain features that CRM reports don’t provide (e.g. multi-channel attribution reports).