The lack of discovery is not inherent in a command line system. The usual counter-example is something like TOPS-20 https://www.bourguet.org/v2/pdp10/users/chap

The lack of discovery is not inherent in a command line system. The usual counter-example is something like TOPS-20 https://www.bourguet.org/v2/pdp10/users/chap2#sec_2 https://www.bourguet.org/v2/pdp10/users/chap2#sec_2 where the command line system was built such that for every command you could interactively in the middle of typing your command line get help about what the possible options were, what the argument for the option you'd just typed was, etc (and this was built in to the system and commands, not a half-baked add-on like bash tab-completion).