LED bulbs for refrigerators and freezers are pretty easy to design since the lower temperatures will let the LEDs run more efficiently. Oven lamps might never get LEDs because normal solder starts to melt around 350F and will soften around 200F so unless they start making the bulbs with exotic and expensive solder we will never see LEDs in the oven.
You can kinda cheat and get the refresh rate down to 300ms with partial refresh but that’s still one hundred times slower than a 30hz conventional display.