I'm going to play devils advocate here, CQP. Back when I used to be active in the running of races (xc and dh), we (clubMUD) ran a few really challenging xc tracks. Fuck, you Shooda heard the whining.
Like you, I prefer more of a challenging technical track, but I loved the interwinter series. Castlemaine was easy, but still fun. Redesdale was good, and definitely challenged a lot of riders, Youies time trial and XCO was a lot of fun, particularly the decents.
Missed the Ballarat round unfortunately.
If tracks ARE to challenging, a lot of people won't go. I'm thinking of some of the roadies I know that also ride a bit of xc. Sure, they're fit, but just don't have the bike skills for the more technical stuff. I don't want tracks watered down, but more riders turning up is surely better for the sport....even if they are on 29ers.