Why can't an active labor schedule be modified even if it hasn't been used to generate costing?

Summary: I'm exploring the possible use of labor schedules. I just wanted confirmation that it's expected functionality that I can't modify an active labor schedule even if it hasn't been used to generate an payroll costings?

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To test, I created and activated a labor schedule from 01/Jan/24 to 31/Jan/24. I'm the only user doing any testing, and I know the Jan-24 Project period has never been opened, so there is no payroll costing for this period for any employee. I can't change the labor schedule. All I can do is duplicate it, inactivate it, the correct and activate the duplicate. I accept it's a solution but it seems unnecessarily cumbersome. I can also accept not being able to modify a labor schedule if it's been used to generate costing.