Partial disagree. There should be lints against 'unwrap's. An 'expect' at least forces you to write down why you are so certain it can't fail. An unwrap is not just hubris, it's also laziness, and has no place in sensitive code.
And yes, there is a lint you can use against slicing ('indexing_slicing') and it's absolutely wild that it's not on by default in clippy.
And yes, there is a lint you can use against slicing ('indexing_slicing') and it's absolutely wild that it's not on by default in clippy.