That's not true. Google Maps, in particular, has by far the best route guidance. It used to be different - but not anymore. Most in-car systems don't even attempt to route the last 300m here because the detailed one-way street narrow layout of tiny streets isn't in their mapping data, or their algorithms are too weak. Google has mostly no problem with that.
Entering Japanese addresses IS tricky, though; here, custom-built Japanese solutions outshine. There are (mainly) no street names; instead, you specify your location by filtering down from Prefecture (Tokyo), City (Ota-ku), Commune (Kugahara), District (1-Chome), Block (26), House Number (1).
Japanese systems allow you to enter it this way - with Google (or, even worse, Apple Maps), it's a bit hacky. You would specify it as Kugahara 1-26-1 and hope for the best.