Many out there are running Windows 10 on hardware that is incapable of upgrading to 11 due to system requirements ineligibility. Google wants them to ditch Windows and move to ChromeOS Flex.
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Google's ChromeOS and ChromeOS Flex have diagnostic tools to let you learn about your battery's health, CPU usage, and memory usage. Unfortunately, they're buried, here's how to get to them.
Linux users can now write ChromeOS Flex to a USB device using the command line. It's unclear how long this has been an option but previously you needed Windows, macOS, or ChromeOS to make the USB.