How to move instead of copy files? (MacBook)

No I don't think so, I guess it is a kind of safety net incase something goes wrong, you will always have the source files.

If you are confident press and hold down the Command key and drag the folder/ files to the destination.

Isn't like what the, holding down the Command key whilst dragging and dropping your files/ folders is universal across Mac OS's.

This does not apply to "dragging" but may be an alternative for you.

• Command-X: Cut the selected item and copy it to the Clipboard.
• Command-C: Copy the selected item to the Clipboard. This also works for files in the Finder.

Adding another wrinkle: if you want to copy a file to any location on an external drive/different partition, then the original will stay where it is and a copy of it will be put on the external drive. However, if you want to move a file from folder A to folder B on the same drive/partition, then the file is actually moved.