I live in London. Apple maps is a disaster. Businesses which have moved shop years ago are in the wrong place. Traffic routes which are congested every day are recommended. It's literally a waste of my life to use this software.
Despite this flaw (and the fact that the head unit is actually useless until your plug in your iPhone), Apple maps is the only navigation software permitted to run on these head units; even though, it is permissible to use Google Maps or Waze when I am walking on the pavement; even though, it is permissible to mount my phone to my car and use an alternative navigation software.
Additionally, on the subject of "wireless grand unification," you can only connect your phone via USB.