Lets not make a contest out of it, every instrument requires a lot of skill. Aphex Twin isn't any less flashy in his skills than say Steve Vai as a guitarist, and there's nothing wrong with that. Being the best at something is nothing to be ashamed of, if you can used those skills to make great music.
It's not inherently bad to be flashy, flaunt it if you have it, as long as that flaunting contributes to the music in a positive way. Some music actually calls for a lot of complexity and expressive musicianshup. Classical, Jazz, Prog.
"Just doing the job and staying out of the way" is fine but not all music has to be that way. Simplicity can be great but so can complexity. There's two sides to the musical coin.