> needlessly avant garde
I'm sorry to say this but there is no such thing as "needlessly avant garde" in Western classical music tradition imho. WCM is about an artist finding his own sound, finding a unique musical language that puts them in the continuum all the way from Bach to him. If your music is not avant garde, it may be great music, but it's not going to be good WCM music. This is just my humble opinion. I almost exclusively listen to contemporary WCM these days, and the way I engage with WCM is different than the way I engage with other genres of music.
Put it as film analogy, the goal is not to make the best horror movie, the best drama, the best scifi; the goal is to make the most creative/innovative/novel/personal/weird movie that happens to be horror, that happens to be drama, that happens to be scifi. At least that's how I enjoy WCM. Everybody experiences music differently, which is what makes it one of the most beautiful human phenomena.
So in short, the more avant garde the better. Note that Schoenberg's music is already grandpa's grandpa music. We want innovation that goes well well beyond Schoenberg. I would consider 12 tone row music ancient at this point, not even remotely avant garde/experimental.