Indeed, and unless that changed since, the Mac downloader isn't even capable of resuming downloads properly so if anything happens while you download these 13GB, it's back to square one.
For years, my team uses the third-party tool `xcodes`... `brew install xcodes` or use the [GUI](https://www.xcodes.app/).
It allows you to easily install and maintain several versions of Xcode (beta / RC versions).
And, more importantly, uses aria2 for HTTP download, which has resumability.
The comment is wrong, the download is ~2 GB
For years, my team uses the third-party tool `xcodes`... `brew install xcodes` or use the [GUI](https://www.xcodes.app/).
It allows you to easily install and maintain several versions of Xcode (beta / RC versions).
And, more importantly, uses aria2 for HTTP download, which has resumability.