The incredibly silly true answer is that the software industry's love for "deploy early, deploy often" has led to all embedded devices shipping with over-the-air (OTA) update support even when it barely makes sense. The earliest units of a given product run will ship with a minimally viable product build that has lots of bugs, but solid OTA.

Fun anecdote: I had a TV backlight die after about 3 years, and the root cause was a shitty embedded app that incorrectly regulated the voltage for the LED strips.

How would it vibrate without wpa3 support?

It doesn't...

But the kind of people who are impressed by a vibrating knife are also likely to be impressed by the ability to update firmware. They don't know what firmware DOES, they just know it's modern.

Don't you think it would vastly improve your stabbing experience if the knife could vibrate the Halloween theme while you're at it?

maybe scientists discovered new frequencies?

To show you ads, of course. Duh.

Microphone was a little muffled, fw update supposed to clear that up.

we've engineered the bolster connection to withstand up to 50 lbs. of pushing force, so you can chop without worry. (Our human arms could only muster 30 lbs. This is why we're nice to the robot.)

Noodle-armed motherfuckers could only manage 30 lbs of force with their arms?

And the wireless charger is sold separately!

JapAnESe sTEeL!!1°!

Then demo cuts the most basic shit any other half decent knife would have no issues with.

But when you press the orange button, the knife cuts with up to 50% less effort

Well, up to 50% less effort for that low price? Sign me the fuck up!

"Hmm, the stab wounds show that this guy was stabbed by an ultrasonic vibrating knife!"

"Really? Those must be rare, what can they sell, maybe a dozen of those per year?"

I'd imagine the handle is designed to absorb it.

Ultrasonic vibrations have been successfully used to make cutting tools more effective for a long time. It doesn't make the cutting edge sharper or amplify the force, it just moves it back and forth slightly, in microscopic imitations of a cutting motion. That does work. Though at the end of the day it won't magically make a dull knife sharp.

Ultrasonic vibrations have also been successfully used to get shit off of surfaces for a long time too. It is a common and effective method. Though it usually involves a bit more than just shaking the thing, but still...

Theoretically this knife could very well do both of those things. Probably not well enough to be worth 425 dollars, but probably entire useless either.

Even with ultrasonic vibrations things will stick because things are elastic and sucktion.

Eh, perhaps not.

Ultrasonic vibration causes tiny cavitation bubbles to form at the interface between metal and liquid, and then those bubbles collapse a tiny second of a fraction later ... quite violently. If it's well designed, then it should clean stuff off of itself just like materials you put in an ultrasonic cleaner.

But these cavitation bubbles are strong enough to eat away at the metal itself as well. I expect this knife might not actually last very long if you use the vibration a lot.

People freak out over the dimples because it means that some day they won't be able to sharpen the knife anymore.

Which ignores that once you are even two millimeters worn down it is probably time to get a new knife regardless due to ergonomics and the like.

And yeah. Vibrations only make sense if you are sawing through food. That is why those (cheap) electric carvers are genuinely amazing and worth grabbing if you are hosting a big roasted meat party (e.g. American and probably also Canadian Thanksgiving). Non-serrated blades don't do that. If you need to saw through your food with a chef's knife then you should have sharpened that years ago. And if you actually CAN saw through your food with the chef's knife, odds are the blade is so fucked up that it is not salvageable to begin with.