[po1nt]

If you couldn't switch, that would be a monopoly. But single point of failure is when you put all your fruit in one basket. Airplanes have redundant systems, even though you can always buy new components. But it's much harder to change them mid-flight.

[gsliepen]

Ok, but that would just be your own website having a single point of failure, not that Let's Encrypt is a single point of failure. Otherwise you could call every certificate authority a single point of failure.