I'm confused. Are you saying that there aren't metal bands that are guilty of this?You still don't quite understand. I'm not talking about tech death. Emotion doesn't necessarily imply introversion or the cliche idea. Rather I simply mean meaning behind the music; an idea or motive. Not just pretty guitar work because it's hard to play.
anyhow, here's a couple modern metalcore/post-hardcore songs that are about passion and atmosphere before technicality.
HORSE- Big Business (especially the last half) http://www.youtube.com/watch?v=4eHo4aYOt6M
Darkest Hour- Ethereal Drain http://www.youtube.com/watch?v=6VEaSsmGioU there's some crazy shredding here but again, it totally works and is not shredding for the sake of shredding.
Alexisonfire- A Dagger Through the Heart of St. Angeles http://www.youtube.com/watch?v=MQyQZocCAzo
Cephalic Carnage- Hybrid http://www.youtube.com/watch?v=E2eg6gfEipw has one of the strangest, most nauseating atmosphere around
There are plenty of valid criticisms for metalcore, I just don't think "mindless technicality" is one of them.