I've had the Pine and Librem phones. Unfortunately neither are anywhere close to a GrapheneOS Pixel.
Discussion
It probably never will be. Centralized control has some benefits, even if it's uncomfortable to admit. Open things will likely always be jankier. To the extent it isn't, someone probably added a centralized layer or product on top (like Google adding proprietary stuff on top of AOSP or Chromium).
Amen