And it is also what makes the most sense if you are using all_of, usually.

For example, you may want to use all_of to check if all the preconditions are met before running a command, is there are no preconditions, then you can run the command.

Or, in a test report, a test case is successful if it and all of its sub-cases are successful, if there are no sub-cases, then that part is considered successful.

Or, you are making a task runner, you exit if all the tasks are completed, if there are no tasks, then you can exit immediately.

Saying that all of nothing is true is the most appropriate behavior, both in theory and in practice.