I really liked WPF for Windows Phone back then. The tooling was great.
I bought a massive 1000+ page book, "Pro WPF in C# 2010," one day. I also had to buy "Home Maintenance For Dummies" the same day. The bookstore cashier laughed at me.
The irony is that WPF itself never went away, and receives support and even occasional minor new features even to this day on .NET Core.
Much like WinForms, there are still many internal line-of-business apps written in it decades ago that are just happily chugging along, ignoring all the post-Silverlight churn in Microsoft dev story.
Microsoft dropped the ball when they rewrote WPF in incompatible forms for the web (Silverlight) and Windows Phone (WinUI) shortly after releasing WPF itself. That ruined developer trust for their GUI library longevity.