With respect, you miss my point. The DL806/1608 mechanical platform was originally created to house iPad generation 3 machines. When the lightening connector was added, it permitted the addition of Generation 4 to be connected directly to the mixer. NEITHER of these platforms support later generations of the iPad, so Mackie created both a mini iPad platform and an iPad Air platform.
When it comes to iPad platform connections, NONE of them support the Air2. So the DL806/1608 can house directly on its mixer only the iPad Air and the latest generation iPad (both have sem dimensions). My observations had nothing to do with remote managment of the DL806/1608, but for those situations where there are two to three players, having an onboard iPad simplifies things considerably.
Back to lurking....
By the way, I have the same list as you have posted.