I'd be curious how much "pushing the envelope" WDI is actually doing.
The Shaman was built by Garner Holt, for example. Disney shut down
MAPO in 2012, sending that work to GH. It's unclear how much "advanced work" is being done at WDI at this point. It would be interesting to know. But, it's likely one of the reasons why you're seeing such a decline in maintenance of the existing AAs and effects. With the layoffs, those skills have left and are likely going to have to be re-learned by the next generation. I don't think we really know the extent GH plays in AA maintenance either.
If you haven't seen already, you may want to poke around on the
Garner Holt website. Their work is truly amazing. And, that work is being seen outside of Disney parks.