The 2016 MacBook Pro no longer receives the latest OS and Apple officially restricts it to Monterey. My primary concern is security, and this end of support means the end of OS security updates (and the more rare firmware updates from Apple). There are plenty of unpatched zero days over the years and even browsers like Chrome no longer support their latest versions on Monterrey.
I have a newer mac that is supported, butthe 2016 MBP is still more than capable for basic use and a supported OS receiving security support (Ubuntu) can both improve security and significantly extend the lifespan of the device, which is not upgradeable and would otherwise end up as e-waste. This also gives you 'throwaway' machine to carry around in public (library, etc.) that doesn't have sensitive data and has less risk if lost/damaged/stolen. If you also have a battery that's new or with a low cycle count, it's a nice way to make use of it and reduce battery usage on your primary Mac.
TB