Should I upgrade the RAM in my Late 2012 Mac Mini from 8GB to 16GB?

Yes, and it’s probably worth it. For general use like browsing, email, and light office work, going from 8GB to 16GB is noticeable — you’ll keep more tabs open without swapping, and apps like Slack or Teams won’t choke your machine. The $30-40 you’ll spend on used RAM is cheap insurance. However, the machine is twelve years old, so heavy tasks like video editing will still feel sluggish. If you’re still on a spinning hard drive, upgrade to an SSD first for a bigger speed boost.