Why cant we create UI groups for device_trackers

Month of "What the heck?!"
1

as per title, why can’t we group device_trackers in the UI group

group:
  my_computers_tracked:
    name: My computers
    entities:
      - device_tracker.computer1
      - device_tracker.computer2
      - device_tracker.computer3
    all: true

a bit like Person, but then for devices.