The reason that it’s a “thing” is because Eurovision ‘discovered’ one of the greatest groups in music history.... ABBA.
Not too much else after that. It was pretty important to you if you were in Europe. Otherwise, so what.
I can’t stand ABBA. We should have nuked Sweden. And by the way, the BBC banned that song for being pro-war. Bucks Fizz also won Eurovision, so what.