I notice that Google Maps does very poorly on my iPhone 13 Pro with the multi-level roads, like riding around in the tunnels under Tokyo or on the roads with highways above the local roads, whereas builtin navigation units usually have no problems with this. I also find their directions to be much harder to follow than the built-in navigation units when riding around the major roads where turning right requires you to exit to the left for instance. Also, Google Maps fails to provide the variety of route options with fine-grained toll-booth costs, that all navigation units I've used in the last 5 years have gotten spot-on.