I have an iPhone 7 Plus, just got the Osmo Mobile last week, and my Moondog lens arrived today. I couldn't wait for the iphone 7 version so I took a chance on the 37mm version.
It is true that Osmo can't balance with the lens on natively, but I 3D-printed a counter weight that I hang off of the right hand side of the Osmo and once I got the correct weight, it seems to work pretty well. I just have a 3/8" bolt sticking out of the weight and I add as many nuts as it needs until it balances. Not the most elegant solution but works.
Under that rationale, you've pretty much eliminated a handful of well-reviewed and commonly used cameras from Sony, Canon, and Panasonic. I mean, your point is valid, but I look at this camera as an already awesome stills camera that now has pretty good video specs. The GH4 is a really good video-oriented camera that takes ok stills.
Isn't Sony's 5-axis stabilization generally poorly reviewed though?
Now my GX85, that's got some serious stabilization worthy of envy.
Plus, the sensor in this camera is the same as the A6300 (at least before Fuji's X-Trans array process is added to it).
In fairness, I think we need to see some real clips from real videographers, as every promo done by camera companies (including Panasonic and Sony) generally look very sharp and video-like.
These videos aren't impressing me much. Look at all those blown-out skies.
At least with a GoPro you get IQ thats better than my iPhone 6; this one, I'm not so sure about that. A waterproof case for my iPhone is pretty damn cheap, if the image quality is gonna be the same.
-Actually, after rewatching the second and third clip, its not so bad. Still think the GoPro looks better.