Windows Phone aesthetics was repulsive to most people at that time; we finally got TrueColor 4k screens and all MS could do was to use 10 colors everywhere and start the flat fad that destroyed UX on most systems. What a waste.
Also, had ms continued production and not burned goodwill at each turn, as well as skipped the crapshow that was windows 8, we could at least had had 3 providers instead of two.