The Linux DMA-BUF protocol for Wayland is widely used these days and supported by multiple compositors for negotiating optimal buffer allocation parameters between clients and compositors. The current fifth version of linux-dmabuf was marked as stable with it working out well and no need for any other changes before removing the “experimental” tag.
The new transient seat protocol for Wayland is for creating short-lived seats for remote users. These transient seats will be automatically removed as soon as the client disconnects. The transient seat protocol is intended for use with Wayland’s virtual input and virtual pointer protocols for remote desktop use.
ION was the only thing supported by hardware manufacturers for many of those years - I’d agree DMA-BUF is the better solution, but switching from ION to DMA-BUF has also broken lots of functionality
It’s good that we can finally use the same protocol from hardware to software