MS lost interest in WinPho pretty much as soon as it birthed a decent product in 8.1
When they discovered that the iPhone X type buyers wouldn't ever be interested in an MS product they ran away, not bothering about the people who quite liked what they had made. The worst bit was their lack of admission that they were running away so they led on buyers to waste money. That's unforgivable.
I still think that Metro was the best phone interface I've ever used.