Whatever we can say about how MS handled Windows Phone development, the OS itself was designed very well - my mother had no issues navigating and reading information out of it (on small HTC 8S), especially tiles. Now she struggles with Android Go on some cheap no-name device.

I still own Nokia 1320 which - if I'm not mistaken, was one of first "phablet" sized devices and I was quite fond of it up until applications have stopped working. Now it just works as any pre-smartphone device: I only pick up calls, send text messages; battery had to be replaced on 4th year which just confirmed the durability of electronics today and planned obsolescence. Back then I've managed to run some beta of Windows 10 Mobile but in the end, my Nokia didn't get it.