Do perfect programs exist? Would we recognise one? More interestingly, how would it handle feature requests?
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One cute feature of markdown I'd not noticed before: there's no syntax for images *without* a description (i.e. alt text).

https://spec.commonmark.org/0.31.2/#images
One day I am going to reach the height of technological sophistication, and every clock in my house will handle daylight savings automatically.
I'm not there yet. I think modern appliances are getting better though.
(Does a microwave really need to know the current time?)
One interesting design choice in Emacs that I haven't seen in other editors: reserved shortcuts.
An Emacs extension shouldn't use F5 through F12, or Ctrl-c LETTER. This lets users configure their own shortcuts. https://www.gnu.org/software/emacs/manual/html_node/emacs/Key-Bindings.html
Does it exist elsewhere? I miss it in VS Code, where e.g. all the Fn keys are already assigned.