I understand there is no photo yet, but was thrust reverser is a "must-have" part in large engines nowadays?That the D-30KP equipped Y-20 having Thrust reverser is common knowledge. But WS-20 on Y-20 having them is not clear.
Since WS-20 is a new engine and since we have only one example Y-20 equipping them, it won't be a surprise to have Thrust Reversal be not included. C-17 is not at all a party to this issue.
what you were asking makes me feels like you are questioning if a new sedan in 2021 have an ABS or not...