Huh??? A recent android phone is far beyond anything garmin has ever built and many garmins have failed and many phones have failed...but so far mine have worked great and for functions and user interface there is no comparison...not even close.
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I have an Android phone so am very familiar with it. I have mapping apps and Waze on it (and on my iPads) and am familiar with them. The phone apps are a good backup that I have in case something happens to my GPS units.
I like that the Garmin's simply work in any condition, don;'t need to be fiddled with and can be counted on. Do you have a Garmin 660 or 590?
My Garmin 660 is something like 7 or 8 years old. Just after I got it the unit fell off the mount. Garmin was very quick to get me both a replacement phone and a replacement mount. My wife got me a Garmin 590 a couple of years ago so I have both mounted. The 590 has a wonderfully integrated traffic app that works quite well. It also has Weather app with weather radar and can display traffic cameras. This all works very well while riding for the 25,000 to 30,000 miles a year I ride.
I stopped using Tracks to navigate when I last used my Garmin eMap. I am not an off-road guy so much of that doesn't matter but I understand there are topographical maps from both Garmin and third parties that can be loaded. Why would I want voice instructions when riding a track? I barely use voice navigation on roads.
Music dimming? My audio system has been doing that for the last seven or 8 years. It also mixes my AM/FM/Weather radio, my iPod, the FRS/GMRS Radio (when I use it) and could connect my phone directly (when I last used the phone I connected it through my Garmin using Bluetooth. Worked fine but I don't like talking on the phone when riding so don't do that now.)
As I said I am happy that phones are getting closer to, and in some ways exceeding, dedicated GPS units. In the past virtually every rider I knew that did a fair amount of riding stopped using their phones and went back to a dedicated GPS unit and perhaps that is now changing.
..Tom