Oh man, Miranda was so great. I used it as my main client until I switched away from windows, but I loved how configurable and light it was. I guess I'm a complainy old fart now, but when one manages to see a time where apps open up, fully drawn, less than 50ms after you press the hotkey, you start hating all the bloated Electron and slow web apps that seem to be all we get nowadays.

A bit off topic, I guess, but I think the thing we most need now is a moderately low-level, easy to use, cross-platform UI toolkit. I don't want my desktop apps to take up 1 GB of RAM each and feel slow.