If at all anything, Claude Code's success disproved this
In any case, Claude Code is not really CLI, but rather a conversational interface.
"htop" is a TUI, "ps" is a CLI. They can both accomplish most of the same things but the user experience is completely different. With htop you're clicking on columns to sort the live-updating process list, while with "ps" you're reading the manual pages to find the right flags to sort the columns, wrapping it in a "watch" command to get it to update periodically, and piping into "head" to get the top N results (or looking for a ps flag to do the same).
claude -p "Question goes here"
As that will print the answer only and exit.