I would love to have extra arms. That would make carrying groceries from the car so much easier, and I could do so many more things at once: I could chop vegetables with one set of arms, and cook with the other. Or maybe I could make a pot of tea with one set of arms and use the other set to waste time on the Internet. The dance world also thinks multiple arms are great, and they look good on stage too, especially in the form of the thousand-hands dance.
As a result, this dance move had to show up somewhere in the Eurovision world too. And though there are fewer people on stage, at the right angle it still looks as cool as it does with 50 people.