How about spoken turn-by-turn navigation first so people can stop risking their lives and the peoples lives around them every time a turn is coming up?
It's not as if Apple doesn't permit them, they just choose not to include it for free.
Would you say Google is obligated to add free text messages to Android just because Apple has it (iMessage) and it saves money for people?
But know your route and Waze can be helpful and even a little fun.
Also, in a strange town traveling down a road for the first time in a rental car at 40 mph I'd like to have another 2 or prompts about which direction I'm going to be heading so I can get in the correct lane.
What's clever is that they also generate automated suggested corrections. Like a local intersection has a little cut-through side road to turn right. It isn't on any maps, but people obviously take it, so Waze noticed a lot of people driving off road there instead of the suggested route, and flagged it as a possible correction.
Waze just seems to me like so much smarter a solution to GPS than the traditional providers. They actually use the two-way features of the phone in a way that a traditional GPS system will not.