Eight gigabytes is orders of magnitude more than an OS could ever use, or even the pre-installed software. It's web browsers and the software that uses them that occupy all the RAM, and those are usually made by third parties.
Open a few news web pages, and run Discord, Slack, VS Code, etc, and you'll quickly run out of RAM.
Open a few news web pages, and run Discord, Slack, VS Code, etc, and you'll quickly run out of RAM.