I don't think there's anything interesting about my onion dice. You'd be seeing a video of a banged up MAC, scraped up from all the times I've casually sharpened it in a hurry, doing the standard one-cross-cut Jacques Pepin onion dice. You know, an onion dice.
(The "Slack friend" thing was just that I felt bad about sharing a link I'd gotten just a few minutes while pretending as if I'd known about it myself. I have no idea their level of expertise! Probably better than mine though.)
Aside from that, in my opinion dicing an onion is a much more simple task for a knife than taking a very thin slice of a tomato. And in both cases it is likely more about the technique/handling and the sharpening than the actual knife material or technology. But the average person does not care about those things, so this knife could at least in principle be something useful for them. Not for someone who is willing to invest some time in the aforementioned things though, like you (and me too, for that matter).
As for the sticking, this is solved by vertical fluting already.
Ultrasonic vibration is a complicated solution for a problem that has already been solved by the simple solution of just sharpening your knives. And you don't need to get expensive either. A Sharpal diamond stone, leather strop and a good workhorse knife like a Victorinox Santoku will get you there :)
