As a vim guy, and I say this because I think it makes more sense in vim, I think you mean insert mode (the “normal” mode) and replace mode (the “insert” mode).

As a vim guy, and I say this because I think it makes more sense in vim, I think you mean insert mode (the “normal” mode) and replace mode (the “insert” mode). The fact that the insert is used to toggle out of the default insertion behaviour seems to add confusion.