I remember the Junsun comparison because of the saucer plate at the end of the lens
Just adds weight and size while looking goofy
Some will like it and some won't, but for me a discreet appearance without anything drawing attention to the unit or making it clearly a camera matters a lot.
As far as mounting no cam fits everywhere or in every car but from a sales point of view, a cam should be designed to fit as many cars as possible. Not easily done with multi-channel cams with the interior cam integrated into the front cam/processor "head unit"
And very good engineering reasons to not do that: EMI and heat
So there's a lot you can infer about a dashcam simply by looking at it if you understand how they work in the real world. That doesn't make any design "bad" but it makes some better than others as it shows you how the designer(s) thought when they made it
Phil