For years, we've had to add AdWords tags, Analytics tags, and more.
Google is mashing them up into a single tag!
Quote = Our new global site tag (gtag.js) will now serve as the single tag for both AdWords and Google Analytics, with support for DoubleClick products coming soon.
This will be very popular, I assume Magento and Shopify and other eComm platforms will be racing to create easy integrations with this new bundled tag.
Google realizes tagging is too often mangled baby ducks, so they're streamlining it.