I might do likewise but if I hadn't already bought a DL even a $6.99 app would have been a serious disincentive, if they sell a $1000 device which won't work without an iPad then the app (at least, they haven't offered a bundled iPad with the DL yet) should be included in the hardware price.
This mixer is going to replace lots of lower end "pub band" mixers (many more than the unique in its class MixWiz) none of which have moveable pre eq/aux inserts so the pre eq/dynamics aux issue is only a big concern for pros stepping down and will not be a concern for the vast majority of users (of course I'd love that feature on my "pub band" desk).
I think it's fair to say that Apple are one of the most successful tech companies in the world and haven't suffered from their technical "isolationism". I'm not an Apple Fanboy (is there such as an Apple Fanpensioner?), I've been into computers and hi-tech for most of my life, I grew up before cassette recorders and cut my computing teeth on DOS. Now while I think Apples business practices are frequently abhorrent, I find myself more and more attracted to products which simply work as expected nearly all of the time. I'm sat in front of a MacBook Pro which I never turn off (OK, once every two or three weeks) but when I'm away from home it lets me get my emails and do a bit of light browsing for a whole long weekend without charging (several hours, my best PC laptop wouldn't run for even two hours without needing charging).
I totally understand why Mackie chose to go with the iPad alone.