The report says that Android Auto is being used by 7% fewer drivers year-over-year while Apple’s CarPlay grew by 2%. That drop likely comes a combination of users who switched their phones from Android to iPhone, as well as those who may have upgraded to a vehicle where they no longer use Android Auto.

Sounds like most of it is manufacturers dropping support.

I recently leased an EV and in it I use the built-in system because it automatically finds and reserves charge stations along my route. The interface is also nicer than Android Auto.

I also recently got to drive a loaner Mercedes EV and the built-in, AR enhanced nav system blows Google Maps away for city driving.

That only applies to EVs though. I use Android Auto everywhere else.