This matches my findings. Asides from some performance footgun, it all strikes me as a single purpose, low level thing with a DX only an LLM could love. I suppose many today don't need more than that but I found the other Rust GUI solutions to be maturing rapidly with better stories across the board.

The main thing GPUI has going for it is mind share and that's a great thing to have. The mind share is unfortunately highly fragmented though as the original authors are not interested in selling a GUI library. Hopefully the community efforts will come together to produce a more polished and general library. A well used library is better than a better designed one maintained by a single person.