It wasn't originally engineered with those features so they wouldn't implement them without doing a completely new LSx series I would imagine. It doesn't need it. If it did have those features it would be undeniably more powerful and more efficient than it currently is. Considering the current specs of the engine and how its performance is arguably superior to most of its competition, adding those features would widen the gap by an even larger margin.
Just because it is more complex does not mean it is better. You are right about perception, and unfortunately, ignorance is bliss among consumers. Throwing more technology at something, and over-engineering is a tactic the Germans are famous for. If only they spent more time perfecting a technology before moving onto something else. That is their downfall. They are horribly unreliable (especially the V8s in regards to BMWs which I have experienced plenty first hand). The upkeep and maintenance costs associated with those German V8s (or anything German for that matter) can be astronomical, and with the addition of new technology, costs are going nowhere but up. Also, your "refined" argument is quite vague. I've driven LS2 equipped vehicles against my M62B44tu, as well as a buddy's S62, and I found the LS2 to be very smooth with a significantly more linear, consistent power delivery.
If it was possible on an OBD2 car like mine, without question I would've swapped out for an LS when the vanos killed my engine a couple years ago.
But consider this, isn't it interesting that dohc engines require all this technology thrown at them to remain somewhat competitive with a "simple" engine such as the LS series?