Why is there no options to set node and edge nonnull on connection field?

I've been trying to set nonnull to node and edge on connection field
because a frontend engineer told me that he've got a lot of things to handler if node and edge are nullable.
is there a specific reason node and edge set to nullable?

No file or test is named. Start by locating the connection-field implementation and checking how node and edge nullability is defined, then compare the requested option with the current GraphQL schema behavior. Done means a maintainer-approved explanation or a clearly scoped implementation decision, with tests identified after the entry point is found.

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