If you visit the Innovv C5 discussion thread over at Goldwing Docs forum, you can download some C5 video and see for yourself.
Innovv C5 Motorcycle Camera Review ? Product Reviews ? goldwingdocs.com
In general, license plates need to be within what looks to me like 25 feet-ish, before they're clearly readable. The good news is that this doesn't change much across the field of view.
You bring up good points. Optics are always a compromise of some sort. Widen the angle, lose clarity, especially when considering necessarily compact lens size. Start with only so many pixels (1920x1080 is about 2 MP) and then smear them over a widened field of view, and it's not too surprising details become less distinct.
I'm looking at the Mobius Maxi also. While nominally an "action" cam, it seems suited to dashcam duty. It has the essentials:
true loop recording,
recording start at power on (and, presumably, stop after power off?),
Takes up to a 128 GB SD card. At $80 (minus SD card, but I have one), I may jump on it. I do not have to have WiFi or Bluetooth connectivity or a companion phone app.
There are 2 flavors of the Maxi, one with a 135° FOV lens, the other 150° FOV. One tends to assume that the smaller FOV would mean increased image quality. It's not quite that simple, though, according to this discussion at the dashcamtalk.com forums:
The Mobius Maxi also offers a higher-res video mode (2.7k @ 30 FPS), but jury's out on video quality and I won't be surprised if it's not worth much. Assuming though that the camera uses a real 4 MP sensor instead of upsampling, the 2.7k mode could be great.