How has the Surface Duo experience held up after one year on the market?

[Windows Central]

Surface Duo is one year old today. How has it improved?
Microsoft's Surface Duo has been available to buy for one year today. Announced almost two years ago at an event in New York City, the Surface Duo has been a polarizing device for being both Microsoft's re-entry into the phone market and its first "foldable" device.
I've been using the Surface Duo as my only smartphone for an entire year, so I'm pretty familiar with it at this point. So, one year on, how is the Surface Duo today? Has Microsoft been good to its customers? Have all the issues been ironed out? Are dual-screens the future?
It's complicated.

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