If you staple (and I agree that stapling is a good idea in principle), you need tools to monitor the stapled OCSP responses in order to have peace of mind about the system. You might think of this as like the fuel for the emergency diesel generator at a data centre, you should make sure you know how much fuel there is and how long it will last, in order to be able to order more fuel, or know you won’t get fuel in time, and plan for what happens then, rather than the lights all go out and you sit in darkness wishing you’d known this would happen.
If there had been comments here on Sunday saying “Why are my OCSP responses only 24 hours from expiring? Isn’t that cutting it fine?” then it might have raised a flag in time to avoid any actual outages. That is now impossible. Some responsibility must lay with Let’s Encrypt (even if this was a CDN fault) but we also need to protect ourselves.