Our group shoots at Monk-stunned foes. I'm sure you can find a way to set up advantage yourself
Remember, this guy doesn't need "range". Consider him a melee combatant, only with a "reach" of 120 ft.
If a monster appears in the distance and it's too dangerous for the monk to go there, obviously he shoots without advantage (and without -5/+10). On the other hand, doing any damage at that distance is still way better than what the swordguys can do...
Point is:
Ranged < Melee
Unless the rules actively limit and penalise ranged.
WotC have kept this ball in play ever since first edition, but this time, they've apparently forgotten about the need to actively repress ranged combat for melee to be a good minmax choice.
They've simply dropped the ball - I can count to six or seven changes between 5E and 3E that all remove useful checks on ranged.