> I haven't seen any terminal apps that actually do what you praise

Micro editor, Emacs with CUA-mode.

Very few TUIs respect Ctrl-C. Note how it doesn’t quit your shell, for example. It’s more that it’s bound to something already, and there is no common concept of a clipboard between terminal applications anyway.

Asking the terminal itself to copy on Ctrl-C, and send Ctrl-C on Ctrl-Shift-C, is usually uncomplicated. If that’s something the user wants. We allow all sorts.

Not really, all the same users, you just place way too much faith in the defaults. Case in point: your second point. Though your pudding is stale: bad defaults are a common scourge of software, so the fact that something is default means nothing positive on its own