[sam_lowry_]

Because it breaks our mental model of how things work.

[skinfaxi]

Or it means it is time to update the model. Models need to change as the world they model changes, right?

[sam_lowry_]

The OpenBSD developers could have opted for a warning, like the one you see about post-quantum encryption when connecting to old servers.

Instead, they just sneaked the change upon the world.