When this came out, I was disappointed by the screen doesn't articulate to the side...like many "camcorders". The ability to handhold/place in unique positions is hindered when you have to plant your head behind the camera. I get to some degree why they went Cfast with high bit rate/depth 4k at the time. But is the ability to record the HD to either card that difficult? Same with RAW stills.
For the talk of it being a pro cam, the recruiting of Jackie Chan for the roll-out seemed muddled. The pre-NAB '16 suggestions from Canon that a big update was coming really seem disproportional to what they delivered. BTW, here you mention the Video assist as an XLR etc solution. As I posted in the GX80 thread, did you get a good one from the get go?(green hue, dropped frames) Some report the fan noise of the 4k assist to be of concern in close quarters.
All that being said, I applaud you for having an open mind to revisit this cam beyond the specs. Maybe a further exploration of this cams baked footage and C-log after judicious post sharpening is in order.