The typical TUI fan is a nerd with no clue about typography so therefore they don't notice any problem with being shown elements that have no reason to be monospaced in monospace.
i.e. ignorance is bliss in the world of typography.
Perhaps the average TUI fan is someone who correctly recognizes the negligible relevance of typography in optimizing their computing workflows, and prefers monospace fonts for purely functional reasons, which naturally take precedence over merely aesthetic concerns when working with functional tools.
The total abandonment of the form-follows-function principle on the part of purely visual designers, who worry about what software looks like without considering what it's for, has led to 10-15 years of cumulative usability degradation in almost all categories of software. TUI and CLI software remains one of the last bastions of people actually designing interfaces for functionality and usability.
Perhaps the average TUI fan is someone who correctly recognizes the negligible relevance of typography in optimizing their computing workflows, and prefers monospace fonts for purely functional reasons, which naturally take precedence over merely aesthetic concerns when working with functional tools.
The total abandonment of the form-follows-function principle on the part of purely visual designers, who worry about what software looks like without considering what it's for, has led to 10-15 years of cumulative usability degradation in almost all categories of software. TUI and CLI software remains one of the last bastions of people actually designing interfaces for functionality and usability.