You can run Gnome just fine, hardware accelerated video decoding/encoding works, HDMI with a few features is mainline, the only thing left is the Mali GPU, which is a fairly simple GPU as far as that kind of hardware goes, as compared to AMD or Nvidia GPUs.
On that note, there has been a fair bit of activity on Lima as of late, which is a big change from a few years ago: https://github.com/yuq/linux-lima/tree/lima-4.16-rc5/drivers...