They at Microsoft don't use many of the stuff that we are supposed to use, e.g. see MAUI.

Also note, Shoelace was built by a Microsoft engineer, Cory LaViska. He left to work on Shoelace full-time[0] after it was acquired by FontAwesome.

[0]: https://blog.fontawesome.com/shoelace-joins-font-awesome/

We considered it, but Fast was missing some key components when we started building our web app.