Some audio is synced and some isn’t?

I’ve seen this brought up here a few times and the general consensus is that it just doesn’t work with the stock system.

But what I’ve started to notice is that some “features” are indeed synced perfectly.

My music is perfectly synced and when navigating the audio is also perfectly synced.. but games, YouTube and Siri are not.

How is it that the audio of some features are in sync and others aren’t? This makes me think that this is a software limitation which might mean there is a way around it right?

 

I've noticed this too and I'm wondering if it's a way to try to prevent you from watching videos while driving? If you use a headphone jack instead of Bluetooth it will be in sync.