A lot of people forget that the default shells of many *nix systems through at least the mid 90s did not support any of these. No line editing, no interactive history (primitive !-based history doesn’t count), no completion.

Occasionally I’ll still encounter an environment that only has a minimalist implementation of sh (e.g. some busybox builds) and be totally stymied. It amazes me how much people accomplished on old *nix systems with such abysmal usability.