[idbehold]

Do those support native OSX key bindings?

[omaranto]

I'm going to guess the answer is yes, but possibly not out of the box.

[Matachines]

I don't know about emacs, but MacVim does.

[ajross]

What value would they have if they did?

The key bindings and their customizability, standard or not, are part of the reason these tools are better than the HID-blessed equivalents.

This question is like whining about a F1 racer because it doesn't have windshield wipers.