They've never done that across all ilvl ranges.
Currently BFA WQ rewards are capped at a mean reward level of 325 (±5). Dungeon WQs and emissaries are 15 above that.
Its no different than legion which capped at ~910 if I remember correctly, but only in 7.3. Nowhere near to the 940 to 960 ilvl you would have with 'good gear' at that point.