Learning to program with pointers is enormously useful. It's simply bad software engineering to not use typing to enforce constraints on access to pointers (or addresses, or however you'd like to term them)

IIRC that talk of about using indices (u32) to represent data in an array. That is orthogonal to representing that information in the type system since you can just type the index

How do you distinguish the array from the index? Is an array not just a pointer and index description?

Interesting talk, thanks for sharing!