It is a gimmick. Can't fault anyone for that.
Although less effective and substantially more.....messy?
Maybe with practice you could achieve tone control but why would you want to?
And her bicep looks freaky.

The "tromba marina," which means fog horn, even though it isn't a horn.

No frets, and the string is never pressed to the finger board. And yet, the fundamental vibrating mode of the string is never used--it would be too low for any written music. The notes played are all harmonics, from the 2nd harmonic upwards.

Admirable that as a westerner he was able to learn this:




But not as good as this:



And here's the guy with the low tones:

Hammer-ons and pull-offs aren't new, but this is getting crazy--in a good way:

Leo Theremin was a Russian engineer and inventor, who made his way to the US in the 1920s, and invented the first electronic instrument--called the Theremin. In 1938 he went back to Russia, where they put him into a special prison for scientists, to work on defense projects.

You play the instrument without ever touching it--you just wave your hands in front of the antennae:



You hear it in many old horror movie and sci-fi movie soundtracks, like "The Day The Earth Stood Still."

Some people still play it, and some of the players are even nice-looking:

btw--Lidia Kavina is Leon Theremin's grand niece. Tim Burton wanted to bring her over to the US to be in the movie "Ed Wood" with Johnnie Depp--so that she and Ed Wood could be shown recording a soundtrack for "Plan 9 From Outer Space."

But the Russian's wouldn't give Lidia a visa.

The first pic reminds me that Rahsaan Roland Kirk used to play several wind intruments simultaneously. But I guess such a thought belongs in the jazz forum ...(His main instruments were tenor, stritch and manzello (sax variations) which Kirk modified himself to accommodate his simultaneous playing technique.)