You can see somewhat complains on discord, other threads, answer hub. More of questions than complains tbh.
As far as I’m concerned it’s not about complaining over something, it’s more about getting some info and feedback as to how to handle stuff that’s been developed by the guys at Epic. It is fresh that’s correct, however ARKit been implemented into the engine around September afair and still it seems like it is indeed a pet project rather than proper integration.