[Riseed]

Excellent answer. Feature propagation & saturation is also a reason to offer/develop a version that doesn't require an OBD port.

Your customer base consists almost exclusively of those who are both willing to spend $499 on an accessory and who don't already have a reverse cam. Many potential customers won't have an OBD port in their car because OBD-I wasn't around until the '90s. Muscle car enthusiasts and parents (happy to spend $499 to prevent an accident) passing down an older car come to mind.

It would be great to see a second generation version that works without OBD.