To me, peak usability was 25 years ago, when most applications had a toolbar and a menu that followed a standard pattern. If you're a frequent, non-power-user, you use the toolbar (e.g. "insert row" button). If you're an infrequent non-power-user, you go through the menu (Insert > Row Above). If you're a power user, you remember the shortcuts indicated through underlined letters in menu labels (e.g. Alt, I, A). If yo…
Except when you talk to the grey hairs, you realize that UI has never, ever changed - it is backwards compatible back to, well, stone age of computers. It is quirky, but once you learn it, you're done for life - no refreshed new looks or skins or dark modes (well, it's always in dark mode) or rewrites in Svelte or whatever. That's basically because the power user is essentially the only user that matters. They know all the arcane key bindings and weird abbreviations, and Bloomberg knows better than to mess with it.
I hated it at first but grew to love the stability of it.