Many mobile publishers uses AppsFlyer for analytics, since there is no plugin that helps C2/C3 projects to fully integrate this analytics we can miss some publishing opportunities. In terms of using C2/C3 on industry I think it's important to support analytics features. other than that is easy to implement this on Unity (don't want to switch to Unity...but not having this kind of features makes me want to)
Love C2 <3
We're a small team and there are endless potential third-party services we could integrate. We will never have time for them all, so we created the addon SDK so the company themselves, or other third-party developers can integrate them instead.