Unless you encrypt your computer’s hard drive, it’s simply an external drive for anyone to plug into their machine and copy. If your laptop is stolen, the thief does not need your password to get most or all of your data.
Down side of encryption for content creators and other speed freaks, it slows down the hard drive. We posted some pics of a 2016 MacBook Pro before and after Apple’s FileVault was applied to the internal drive. Note the significant, write speed, decrease.
Best to encrypt your operating system drive and keep sensitive files there. An unencrypted, external, USB3 or Thunderbolt drive is best for content creation anyway.
Did you know that the SSD in your computer has a limited lifespan? SSDs wear (like tires) over time. They have dedicated space set aside to replace the worn parts. Once that reserve is used up the drive is no good. The more you use the drive, the faster it can wear out. So moving all that audio and video data back and forth on your internal drive is not a great idea, it’s the most expensive one to replace.