According to this site, PTO is not guaranteed anywhere unless it's in your contract. Sick time is in some states.
Final Pay Rights: Getting Your Last Paycheck | Workplace Fairness
Final Pay: Getting Your Last Paycheck Getting your final paycheck and being paid everything you are owed can be a tricky situation. What do you do with your accrued vacation days? What if your former employer doesn’t want to pay? Do you get paid during your two-week notice? This page can help...www.workplacefairness.org
That all is true for manufacturing. But corporate office jobs and office jobs for service / retail jobs generally don't shut down for a week or 2 if things are slow. When it comes to manufacturing, you absolutely wouldn't see businesses asking employees to use PTO instead of shutting down. But this does happen in the corporate office space.
I think we are just both looking at it from a different industry perspective. And my focused was more on the logic of explaining the mindset of why they would make this decision verses explaining the industries where these types of decisions actually happen.