Hi @vertigo
(Im not a Qorvo guy) but the range promise can be archived with certain settings. But they are many limits so it is harder to use it. For UWB devices you still need to keep in mind that there is regulations that limit the TX power very low and both devices DW1K and DW3K can archive this limit.
But you are correct the DW1000 maximum power level is higher that DW3K.
Cheers
JK