I still cannot fathom why platform is in an abandoned state.Hopefully they are working on something big.My list of

Pros:

Windows phone ran absolutely fine on lowest hardware available

Live tiles and pinning was best part of the UI

Basic things like dialer,messages and emails were simple and intuitive

Phone never slowed down after using for long time(no need of periodic resets)

Updates never used to slow the phone

Cons:

Basic apps like whatsapp or Facebook were really slow.Slow startup times,no feature parity etc.

Absolute lack of new trendy apps