I think there were just a bunch of other features they wanted to give exposure (ML, speaker, etc), and the kid-friendly tools out there for it won't support Zigbee.
However I bet Nordic's examples for Zigbee on nRF52833 would work pretty much as-is (maybe just changing a few pin names) so you could get up and running pretty quickly.
However I bet Nordic's examples for Zigbee on nRF52833 would work pretty much as-is (maybe just changing a few pin names) so you could get up and running pretty quickly.