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TBH, many sat navs do this, including Google maps, not just the manufacturer's in-house ones. I think that one of the main problems with sat navs, as with people, is that they do the 'lemming thing' - which affects the outcome of what it recommends you subsequently do, i.e.
Traffic busy on the motorway in front - tells you to get off and go through a town's road that run parallel to the original road;
Many people get the same 'instruction' on their sat nav, and all turn off arounf the same time, thus diverting a large portion of traffic onto the (lower capacity) local roads, making them jam up in a few minutes;
The sat nav systems get such data, take a few minutes to process it all and send updates to those on the road, telling them it's now better to go back to the original road because there's (now) less traffic on it.
Rinse and repeat. This happened to me all the time when travelling to work near Stevenage, using a small section of the A1 and/or local roads. In the end, unless my work phone's Google maps said there was an accident blocking the road ahead (anywhere), I just used my own judgement based on previous experiences at the time of day/day of the week and what I could see ahead to decide which route was the better one.
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